diff --git a/2021/solution/hw14-subgroup-solution/README.md b/2021/solution/hw14-subgroup-solution/README.md
new file mode 100644
index 0000000..c22da53
--- /dev/null
+++ b/2021/solution/hw14-subgroup-solution/README.md
@@ -0,0 +1 @@
+# README.md
\ No newline at end of file
diff --git a/2021/solution/hw14-subgroup-solution/hw-preamble.tex b/2021/solution/hw14-subgroup-solution/hw-preamble.tex
new file mode 100644
index 0000000..8bee42b
--- /dev/null
+++ b/2021/solution/hw14-subgroup-solution/hw-preamble.tex
@@ -0,0 +1,199 @@
+% hw-preamble.tex
+
+% geometry for A4 paper
+% See https://tex.stackexchange.com/a/119912/23098
+\geometry{
+  left=20.0mm,
+  top=20.0mm,
+  bottom=20.0mm,
+  textwidth=130mm, % main text block
+  marginparsep=5.0mm, % gutter between main text block and margin notes
+  marginparwidth=50.0mm % width of margin notes
+}
+
+% for colors
+\usepackage{xcolor} % usage: \color{red}{text}
+% predefined colors
+\newcommand{\red}[1]{\textcolor{red}{#1}} % usage: \red{text}
+\newcommand{\blue}[1]{\textcolor{blue}{#1}}
+\newcommand{\teal}[1]{\textcolor{teal}{#1}}
+\newcommand{\R}{\mathbb{R}}
+
+\usepackage{todonotes}
+
+% heading
+\usepackage{sectsty}
+\setcounter{secnumdepth}{2}
+\allsectionsfont{\centering\huge\rmfamily}
+
+% for Chinese
+\usepackage{xeCJK}
+\usepackage{zhnumber}
+\setCJKmainfont[BoldFont=FandolSong-Bold.otf]{FandolSong-Regular.otf}
+
+% for fonts
+\usepackage{fontspec}
+\newcommand{\song}{\CJKfamily{song}}
+\newcommand{\kai}{\CJKfamily{kai}}
+
+% To fix the ``MakeTextLowerCase'' bug:
+% See https://github.com/Tufte-LaTeX/tufte-latex/issues/64#issuecomment-78572017
+% Set up the spacing using fontspec features
+\renewcommand\allcapsspacing[1]{{\addfontfeature{LetterSpace=15}#1}}
+\renewcommand\smallcapsspacing[1]{{\addfontfeature{LetterSpace=10}#1}}
+
+% for url
+\usepackage{hyperref}
+\hypersetup{colorlinks = true,
+  linkcolor = teal,
+  urlcolor  = teal,
+  citecolor = blue,
+  anchorcolor = blue}
+
+\newcommand{\me}[4]{
+    \author{
+      {\bfseries 姓名：}\underline{#1}\hspace{2em}
+      {\bfseries 学号：}\underline{#2}\hspace{2em}\\[10pt]
+      {\bfseries 评分：}\underline{#3\hspace{3em}}\hspace{2em}
+      {\bfseries 评阅：}\underline{#4\hspace{3em}}
+  }
+}
+
+% Please ALWAYS Keep This.
+\newcommand{\noplagiarism}{
+  \begin{center}
+    \fbox{\begin{tabular}{@{}c@{}}
+      请独立完成作业，不得抄袭。\\
+      若得到他人帮助, 请致谢。\\
+      若参考了其它资料，请给出引用。\\
+      鼓励讨论，但需独立书写解题过程。
+    \end{tabular}}
+  \end{center}
+}
+
+% \newcommand{\goal}[1]{
+%   \begin{center}{\fcolorbox{blue}{yellow!60}{\parbox{0.50\textwidth}{\large
+%     \begin{itemize}
+%       \item 体会``思维的乐趣''
+%       \item 初步了解递归与数学归纳法
+%       \item 初步接触算法概念与问题下界概念
+%     \end{itemize}}}}
+%   \end{center}
+% }
+
+% Each hw consists of four parts:
+\newcommand{\beginrequired}{\hspace{5em}\section{作业 (必做部分)}}
+\newcommand{\beginoptional}{\section{作业 (选做部分)}}
+\newcommand{\beginot}{\section{Open Topics}}
+\newcommand{\begincorrection}{\section{订正}}
+\newcommand{\beginfb}{\section{反馈}}
+
+% for math
+\usepackage{amsmath, mathtools, amsfonts, amssymb}
+\newcommand{\set}[1]{\{#1\}}
+\newcommand{\ps}[1]{\mathcal{P}(#1)}
+
+% define theorem-like environments
+\usepackage[amsmath, thmmarks]{ntheorem}
+
+\theoremstyle{break}
+\theorempreskip{2.0\topsep}
+\theorembodyfont{\song}
+\theoremseparator{}
+\newtheorem{problem}{题目}[subsection]
+\renewcommand{\theproblem}{\arabic{problem}}
+\newtheorem{definition}{定义}[subsection]
+\renewcommand{\thedefinition}{\arabic{definition}}
+\newtheorem{theorem}{定理}[subsection]
+\renewcommand{\thetheorem}{\arabic{theorem}}
+\newtheorem{ot}{Open Topics}
+
+\theorempreskip{3.0\topsep}
+\theoremheaderfont{\kai\bfseries}
+\theoremseparator{：}
+\theorempostwork{\bigskip\hrule}
+\newtheorem*{solution}{解答}
+\theorempostwork{\bigskip\hrule}
+\newtheorem*{revision}{订正}
+
+\theoremstyle{plain}
+\newtheorem*{cause}{错因分析}
+\newtheorem*{remark}{注}
+
+\theoremstyle{break}
+\theorempostwork{\bigskip\hrule}
+\theoremsymbol{\ensuremath{\Box}}
+\newtheorem*{proof}{证明}
+
+% \newcommand{\ot}{\blue{\bf [OT]}}
+
+% for figs
+\renewcommand\figurename{图}
+\renewcommand\tablename{表}
+
+% for fig without caption: #1: width/size; #2: fig file
+\newcommand{\fig}[2]{
+  \begin{figure}[htbp]
+    \centering
+    \includegraphics[#1]{#2}
+  \end{figure}
+}
+% for fig with caption: #1: width/size; #2: fig file; #3: caption
+\newcommand{\figcap}[3]{
+  \begin{figure}[htbp]
+    \centering
+    \includegraphics[#1]{#2}
+    \caption{#3}
+  \end{figure}
+}
+% for fig with both caption and label: #1: width/size; #2: fig file; #3: caption; #4: label
+\newcommand{\figcaplbl}[4]{
+  \begin{figure}[htbp]
+    \centering
+    \includegraphics[#1]{#2}
+    \caption{#3}
+    \label{#4}
+  \end{figure}
+}
+% for margin fig without caption: #1: width/size; #2: fig file
+\newcommand{\mfig}[2]{
+  \begin{marginfigure}
+    \centering
+    \includegraphics[#1]{#2}
+  \end{marginfigure}
+}
+% for margin fig with caption: #1: width/size; #2: fig file; #3: caption
+\newcommand{\mfigcap}[3]{
+  \begin{marginfigure}
+    \centering
+    \includegraphics[#1]{#2}
+    \caption{#3}
+  \end{marginfigure}
+}
+
+\usepackage{fancyvrb}
+
+% for algorithms
+\usepackage[]{algorithm}
+\usepackage[]{algpseudocode} % noend
+% See [Adjust the indentation whithin the algorithmicx-package when a line is broken](https://tex.stackexchange.com/a/68540/23098)
+\newcommand{\algparbox}[1]{\parbox[t]{\dimexpr\linewidth-\algorithmicindent}{#1\strut}}
+\newcommand{\hStatex}[0]{\vspace{5pt}}
+\makeatletter
+\newlength{\trianglerightwidth}
+\settowidth{\trianglerightwidth}{$\triangleright$~}
+\algnewcommand{\LineComment}[1]{\Statex \hskip\ALG@thistlm \(\triangleright\) #1}
+\algnewcommand{\LineCommentCont}[1]{\Statex \hskip\ALG@thistlm%
+  \parbox[t]{\dimexpr\linewidth-\ALG@thistlm}{\hangindent=\trianglerightwidth \hangafter=1 \strut$\triangleright$ #1\strut}}
+\makeatother
+
+% for footnote/marginnote
+% see https://tex.stackexchange.com/a/133265/23098
+\usepackage{tikz}
+\newcommand{\circled}[1]{%
+  \tikz[baseline=(char.base)]
+  \node [draw, circle, inner sep = 0.5pt, font = \tiny, minimum size = 8pt] (char) {#1};
+}
+\renewcommand\thefootnote{\protect\circled{\arabic{footnote}}}
+
+\newcommand{\score}[1]{{\bf [#1 分]}}
\ No newline at end of file
diff --git a/2021/solution/hw14-subgroup-solution/hw14-subgroup-solution.pdf b/2021/solution/hw14-subgroup-solution/hw14-subgroup-solution.pdf
new file mode 100644
index 0000000..b9ba012
Binary files /dev/null and b/2021/solution/hw14-subgroup-solution/hw14-subgroup-solution.pdf differ
diff --git a/2021/solution/hw14-subgroup-solution/hw14-subgroup-solution.tex b/2021/solution/hw14-subgroup-solution/hw14-subgroup-solution.tex
new file mode 100644
index 0000000..2f01438
--- /dev/null
+++ b/2021/solution/hw14-subgroup-solution/hw14-subgroup-solution.tex
@@ -0,0 +1,175 @@
+% hw14-subgroup-solution.tex
+
+% !TEX program = xelatex
+%%%%%%%%%%%%%%%%%%%%
+% see http://mirrors.concertpass.com/tex-archive/macros/latex/contrib/tufte-latex/sample-handout.pdf
+% for how to use tufte-handout
+\documentclass[a4paper, justified]{tufte-handout}
+
+\input{hw-preamble} % feel free to modify this file if you understand LaTeX well
+%%%%%%%%%%%%%%%%%%%%
+\title{14. 群论: 子群 (14-subgroup)}
+\me{魏恒峰}{hfwei@nju.edu.cn}{}{}
+\date{2021年06月11日 发布作业 \\ 2021年06月23日 发布答案}
+%%%%%%%%%%%%%%%%%%%%
+\begin{document}
+\maketitle
+%%%%%%%%%%%%%%%%%%%%
+\noplagiarism % PLEASE DON'T DELETE THIS LINE!
+%%%%%%%%%%%%%%%%%%%%
+\begin{abstract}
+\end{abstract}
+%%%%%%%%%%%%%%%%%%%%
+\beginrequired
+%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%
+\begin{problem}[\score{4} $\star\star$]
+  设 $H \le G$。请证明,
+  \[
+    aH = H \iff a \in H \iff aH \le G
+  \]
+\end{problem}
+
+\begin{proof}
+  \begin{enumerate}[(1)]
+    \item 先证明 $aH = H \iff a \in H$。
+      \begin{itemize}
+        \item 先证明 $aH = H \implies a \in H$。\\
+          假设 $aH = H$。
+          \[
+            a = ae \in aH = H.
+          \]
+        \item 再证明 $a \in H \implies aH = H$。\\
+          假设 $a \in H$。
+          首先, 由于 $H \le G$ 满足封闭性, 所以 $aH \subseteq H$。
+          其次, 对于任意 $h \in H$, 由于 $H \le G$ 满足封闭性,
+          所以 $a^{-1}h \in H$ 且
+          \[
+            h = a (a^{-1}h) \in aH.
+          \]
+          因此, $H \subseteq aH$。
+      \end{itemize}
+    \item 再证明 $a \in H \iff aH \le G$。\\
+      \begin{itemize}
+        \item 先证明 $a \in H \implies aH \le G$。\\
+          根据 (1),
+          \[
+            a \in H \implies aH = H \implies aH \le G.
+          \]
+        \item 再证明 $aH \le G \implies a \in H$。
+          \[
+            aH \le G \implies e \in aH \implies a^{-1} \in H \implies a \in H.
+          \]
+      \end{itemize}
+  \end{enumerate}
+\end{proof}
+%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%
+\begin{problem}[\score{5 = 2 + 3} $\star\star\star$]
+  设 $\phi$ 是从群 $G$ 到 $G'$ 的同态映射。
+  请证明,
+  \begin{enumerate}[(1)]
+    \item
+      \[
+        H \le G \implies \phi(H) \le G'.
+      \]
+    \item
+      \[
+        H \triangleleft G \implies \phi(H) \triangleleft G'.
+      \]
+  \end{enumerate}
+\end{problem}
+
+\begin{proof}
+\end{proof}
+%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%
+\begin{problem}[\score{3} $\star\star$]
+  请计算
+  \[
+    \begin{pmatrix}
+      1 & 2 & 3 & 4 & 5 \\
+      1 & 3 & 4 & 5 & 2
+    \end{pmatrix}
+    \begin{pmatrix}
+      1 & 2 & 3 & 4 & 5 \\
+      3 & 2 & 4 & 1 & 5
+    \end{pmatrix},
+  \]
+  并将结果写成(不相交)轮换的乘积。
+\end{problem}
+
+\begin{solution}
+  \[
+    \begin{pmatrix}
+      1 & 2 & 3 & 4 & 5 \\
+      1 & 3 & 4 & 5 & 2
+    \end{pmatrix}
+    \begin{pmatrix}
+      1 & 2 & 3 & 4 & 5 \\
+      3 & 2 & 4 & 1 & 5
+    \end{pmatrix} =
+    \begin{pmatrix}
+      1 & 2 & 3 & 4 & 5 \\
+      4 & 3 & 5 & 1 & 2
+    \end{pmatrix}
+    = (1\; 4) (2\; 3\; 5)
+  \]
+\end{solution}
+%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%
+\begin{problem}[\score{3} $\star\star\star$]
+  考虑如下定义。
+  \begin{definition}[元素的阶]
+    设 $G$ 是有限群, $e$ 为 $G$ 的单位元, $a \in G$。
+    使 $a^{r} = e$ 成立的最小正整数称为 $a$ 的阶
+    (order)~\footnote{注意, 群的阶指的是集合 $G$ 的大小, 即 $|G|$。},
+    记作 $\text{ord}\; a = r$。
+  \end{definition}
+  设 $G$ 是有限群。请证明,
+  \[
+    \forall a \in G.\; (\text{ord}\; a) \big\vert |G|.
+  \]
+\end{problem}
+
+\begin{proof}
+\end{proof}
+%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%
+\begin{problem}[\score{5 = 2 + 1 + 2} $\star\star\star$]
+  考虑从乘法群 $\R^{\ast} = \R \setminus \set{0}$
+  到乘法群 $\R^{+}$ 的函数 $f: x \mapsto |x|$。
+  \begin{enumerate}[(1)]
+    \item 请证明, $f$ 是从 $\R^{\ast}$ 到 $\R^{+}$ 的同态。
+    \item 求 $\text{Ker}\; \phi$。
+    \item 套用群同态基本定理, 给出相应结论, 并用一两句话解释该结论。
+  \end{enumerate}
+\end{problem}
+
+\begin{proof}
+\end{proof}
+%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%%%%%%
+% 如果没有需要订正的题目，可以把这部分删掉
+\begincorrection
+%%%%%%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%%%%%%
+% 如果没有反馈，可以把这部分删掉
+\beginfb
+
+你可以写 (也可以发邮件或者使用``教学立方'')
+\begin{itemize}
+  \item 对课程及教师的建议与意见
+  \item 教材中不理解的内容
+  \item 希望深入了解的内容
+  \item $\cdots$
+\end{itemize}
+%%%%%%%%%%%%%%%%%%%%
+\end{document}
\ No newline at end of file
diff --git a/2021/solution/hw14-subgroup-solution/tufte-book.cls b/2021/solution/hw14-subgroup-solution/tufte-book.cls
new file mode 100644
index 0000000..11d5015
--- /dev/null
+++ b/2021/solution/hw14-subgroup-solution/tufte-book.cls
@@ -0,0 +1,80 @@
+\NeedsTeXFormat{LaTeX2e}[1994/06/01]
+
+\ProvidesClass{tufte-book}[2009/12/11 v3.5.0 Tufte-book class]
+
+%%
+% Declare we're tufte-book
+\newcommand{\@tufte@class}{book}% the base LaTeX class (defaults to the article/handout style)
+\newcommand{\@tufte@pkgname}{tufte-book}% the name of the package (defaults to tufte-handout)
+
+%%
+% Load the common style elements
+\input{tufte-common.def}
+
+
+%%
+% Set up any book-specific stuff now
+
+%%
+% The front matter in Tufte's /Beautiful Evidence/ contains everything up
+% to the opening page of Chapter 1.  The running heads, when they appear,
+% contain only the (arabic) page number in the outside corner.
+%\newif\if@mainmatter \@mainmattertrue
+\renewcommand\frontmatter{%
+  \cleardoublepage%
+  \@mainmatterfalse%
+  \pagenumbering{arabic}%
+  %\pagestyle{plain}%
+  \fancyhf{}%
+  \ifthenelse{\boolean{@tufte@twoside}}%
+    {\fancyhead[LE,RO]{\thepage}}%
+    {\fancyhead[RE,RO]{\thepage}}%
+}
+
+
+%%
+% The main matter in Tufte's /Beautiful Evidence/ doesn't restart the page
+% numbering---it continues where it left off in the front matter.
+\renewcommand\mainmatter{%
+  \cleardoublepage%
+  \@mainmattertrue%
+  \fancyhf{}%
+  \ifthenelse{\boolean{@tufte@twoside}}%
+    {% two-side
+      \renewcommand{\chaptermark}[1]{\markboth{##1}{}}%
+      \fancyhead[LE]{\thepage\quad\smallcaps{\newlinetospace{\plaintitle}}}% book title
+      \fancyhead[RO]{\smallcaps{\newlinetospace{\leftmark}}\quad\thepage}% chapter title
+    }%
+    {% one-side
+      \fancyhead[RE,RO]{\smallcaps{\newlinetospace{\plaintitle}}\quad\thepage}% book title
+    }%
+}
+
+
+%%
+% The back matter contains appendices, indices, glossaries, endnotes,
+% biliographies, list of contributors, illustration credits, etc.
+\renewcommand\backmatter{%
+  \if@openright%
+    \cleardoublepage%
+  \else%
+    \clearpage%
+  \fi%
+  \@mainmatterfalse%
+}
+
+%%
+% Only show the chapter titles in the table of contents
+\setcounter{tocdepth}{0}
+
+%%
+% If there is a `tufte-book-local.sty' file, load it.
+
+\IfFileExists{tufte-book-local.tex}
+  {\input{tufte-book-local}
+   \TufteInfoNL{Loading tufte-book-local.tex}}
+  {}
+
+%%
+% End of file
+\endinput
diff --git a/2021/solution/hw14-subgroup-solution/tufte-common.def b/2021/solution/hw14-subgroup-solution/tufte-common.def
new file mode 100644
index 0000000..7987850
--- /dev/null
+++ b/2021/solution/hw14-subgroup-solution/tufte-common.def
@@ -0,0 +1,1903 @@
+%%
+%% This file contains the code that is common to the Tufte-LaTeX document classes.
+%%
+
+\ProvidesFile{tufte-common.def}[2009/12/11 v3.5.0 Common code for the Tufte-LaTeX styles]
+
+%%
+% The `xkeyval` package simplifies the user interface for the document class options
+\RequirePackage{xkeyval}
+
+%%
+% We use the `xifthen` package to handle our package option switches
+\RequirePackage{xifthen}
+
+%%
+% Define some shortcut macros for error/warning/info logging.
+
+\newcommand{\TufteWarning}[1]{\ClassWarning{\@tufte@pkgname}{#1}}
+\newcommand{\TufteWarningNL}[1]{\ClassWarningNoLine{\@tufte@pkgname}{#1}}
+\newcommand{\TufteInfo}[1]{\ClassInfo{\@tufte@pkgname}{#1}}
+\newcommand{\TufteInfoNL}[1]{\ClassInfo{\@tufte@pkgname}{#1\@gobble}}
+\newcommand{\TufteDebugInfo}[1]{\ifthenelse{\boolean{@tufte@debug}}{\TufteInfo{#1}}{}}
+\newcommand{\TufteDebugInfoNL}[1]{\ifthenelse{\boolean{@tufte@debug}}{\TufteInfoNL{#1}}{}}
+\newcommand{\TufteError}[2]{\ClassError{\@tufte@pkgname}{#1}{#2}}
+
+%%
+% `debug` option -- provides more information in the .log file for use in
+% troubleshooting problems
+\newboolean{@tufte@debug}
+\DeclareOptionX[tufte]<common>{debug}{\setboolean{@tufte@debug}{true}}
+
+%%
+% `nofonts` option -- does not load any fonts
+% `fonts` option -- tries to load fonts
+\newboolean{@tufte@loadfonts}\setboolean{@tufte@loadfonts}{true}
+\DeclareOptionX[tufte]<common>{fonts}{\setboolean{@tufte@loadfonts}{true}}
+\DeclareOptionX[tufte]<common>{nofonts}{\setboolean{@tufte@loadfonts}{false}}
+
+%%
+% `nols` option -- does not configure letterspacing
+% `ls` option -- configures letterspacing
+\newboolean{@tufte@letterspace}\setboolean{@tufte@letterspace}{true}
+\DeclareOptionX[tufte]<common>{ls}{\setboolean{@tufte@letterspace}{true}}
+\DeclareOptionX[tufte]<common>{nols}{\setboolean{@tufte@letterspace}{false}}
+
+%%
+% `titlepage` option -- creates a full title page with \maketitle
+
+\newboolean{@tufte@titlepage}
+\DeclareOptionX[tufte]<common>{titlepage}{\setboolean{@tufte@titlepage}{true}}
+\DeclareOptionX[tufte]<common>{notitlepage}{\setboolean{@tufte@titlepage}{false}}
+
+%%
+% `a4paper` option
+
+\newboolean{@tufte@afourpaper}
+\DeclareOptionX[tufte]<common>{a4paper}{\setboolean{@tufte@afourpaper}{true}}
+
+%%
+% `b5paper` option
+
+\newboolean{@tufte@bfivepaper}
+\DeclareOptionX[tufte]<common>{b5paper}{\setboolean{@tufte@bfivepaper}{true}}
+
+%%
+% `sfsidenotes` option -- typesets sidenotes in sans serif typeface
+
+\newboolean{@tufte@sfsidenotes}
+\DeclareOptionX[tufte]<common>{sfsidenotes}{\setboolean{@tufte@sfsidenotes}{true}}
+
+%%
+% `symmetric` option -- puts marginpar space to the outside edge of the page
+%   Note: this option forces the twoside option (see the .cls files)
+
+\newboolean{@tufte@symmetric}
+\DeclareOptionX[tufte]<common>{symmetric}{
+  \setboolean{@tufte@symmetric}{true}
+  \TufteInfoNL{The `symmetric` option implies `twoside`}
+  \ExecuteOptionsX[tufte]<common>{twoside}
+}
+
+%%
+% `twoside` option -- alternates running heads
+
+\newboolean{@tufte@twoside}
+\DeclareOptionX[tufte]<common>{twoside}{%
+  \setboolean{@tufte@twoside}{true}
+  \TufteInfoNL{Passing the `twoside` option to the `\@tufte@class` class}
+  \PassOptionsToClass{twoside}{\@tufte@class}
+}
+
+%%
+% `notoc` option -- suppresses the Tufte-style table of contents
+
+\newboolean{@tufte@toc}
+\setboolean{@tufte@toc}{true}
+\DeclareOptionX[tufte]<common>{notoc}{\setboolean{@tufte@toc}{false}}
+\DeclareOptionX[tufte]<common>{toc}{\setboolean{@tufte@toc}{true}}
+
+%%
+% `justified` option -- uses fully justified text (flush left and flush
+% right) instead of ragged right.
+
+\newboolean{@tufte@justified}
+\DeclareOptionX[tufte]<common>{justified}{\setboolean{@tufte@justified}{true}}
+
+%%
+% `bidi` option -- loads the bidi package for bi-directional text
+
+\newboolean{@tufte@loadbidi}
+\DeclareOptionX[tufte]<common>{bidi}{\setboolean{@tufte@loadbidi}{true}}
+\DeclareOptionX[tufte]<common>{nobidi}{\setboolean{@tufte@loadbidi}{false}}
+
+%%
+% `nohyper` option -- suppresses loading of the hyperref package
+
+\newboolean{@tufte@loadhyper}
+\setboolean{@tufte@loadhyper}{true}
+\DeclareOptionX[tufte]<common>{hyper}{\setboolean{@tufte@loadhyper}{true}}
+\DeclareOptionX[tufte]<common>{nohyper}{\setboolean{@tufte@loadhyper}{false}}
+
+%%
+% `sidenote`, `marginnote`, `caption`, `citation`, `marginals` options
+% Each allows one of {justified,raggedleft,raggedright,raggedouter,auto}.
+
+\newcommand*{\@tufte@sidenote@justification}{\@tufte@justification@autodetect}
+\define@choicekey*+[tufte]{common}{sidenote}[\@tufte@kvtext\@tufte@kvnum]{justified,raggedleft,raggedright,raggedouter,auto}[auto]{%
+  \ifcase\@tufte@kvnum\relax
+    \renewcommand*{\@tufte@sidenote@justification}{\justifying}% justified
+  \or
+    \renewcommand*{\@tufte@sidenote@justification}{\RaggedLeft}% ragged left
+  \or
+    \renewcommand*{\@tufte@sidenote@justification}{\RaggedRight}% ragged right
+  \or
+    \renewcommand*{\@tufte@sidenote@justification}{\@tufte@justification@outer}% ragged outer (flush right on verso pages, flush left on recto pages)
+  \or
+    \renewcommand*{\@tufte@sidenote@justification}{\@tufte@justification@autodetect}% autodetects best justification mode based on all class options
+  \fi
+}{%
+  \TufteWarningNL{Invalid option `#1` for sidenote key.\MessageBreak Must be one of: justified, raggedleft,\MessageBreak raggedright, raggedouter, auto}
+  \renewcommand*{\@tufte@sidenote@justification}{\@tufte@justification@autodetect}% autodetects best justification mode based on all class options
+}
+
+\newcommand*{\@tufte@marginnote@justification}{\@tufte@justification@autodetect}
+\define@choicekey*+[tufte]{common}{marginnote}[\@tufte@kvtext\@tufte@kvnum]{justified,raggedleft,raggedright,raggedouter,auto}[auto]{%
+  \ifcase\@tufte@kvnum\relax
+    \renewcommand*{\@tufte@marginnote@justification}{\justifying}% justified
+  \or
+    \renewcommand*{\@tufte@marginnote@justification}{\RaggedLeft}% ragged left
+  \or
+    \renewcommand*{\@tufte@marginnote@justification}{\RaggedRight}% ragged right
+  \or
+    \renewcommand*{\@tufte@marginnote@justification}{\@tufte@justification@outer}% ragged outer (flush right on verso pages, flush left on recto pages)
+  \or
+    \renewcommand*{\@tufte@marginnote@justification}{\@tufte@justification@autodetect}% autodetects best justification mode based on all class options
+  \fi
+}{%
+  \TufteWarningNL{Invalid option `#1` for marginnote key.\MessageBreak Must be one of: justified, raggedleft,\MessageBreak raggedright, raggedouter, auto}
+  \renewcommand*{\@tufte@marginnote@justification}{\@tufte@justification@autodetect}% autodetects best justification mode based on all class options
+}
+
+\newcommand*{\@tufte@caption@justification}{\@tufte@justification@autodetect}
+\define@choicekey*+[tufte]{common}{caption}[\@tufte@kvtext\@tufte@kvnum]{justified,raggedleft,raggedright,raggedouter,auto}[auto]{%
+  \ifcase\@tufte@kvnum\relax
+    \renewcommand*{\@tufte@caption@justification}{\justifying}% justified
+  \or
+    \renewcommand*{\@tufte@caption@justification}{\RaggedLeft}% ragged left
+  \or
+    \renewcommand*{\@tufte@caption@justification}{\RaggedRight}% ragged right
+  \or
+    \renewcommand*{\@tufte@caption@justification}{\@tufte@justification@caption@outer}% ragged outer (flush right on verso pages, flush left on recto pages)
+  \or
+    \renewcommand*{\@tufte@caption@justification}{\@tufte@justification@autodetect}% autodetects best justification mode based on all class options
+  \fi
+}{%
+  \TufteWarningNL{Invalid option `#1` for caption key.\MessageBreak Must be one of: justified, raggedleft,\MessageBreak raggedright, raggedouter, auto}
+  \renewcommand*{\@tufte@caption@justification}{\@tufte@justification@autodetect}% autodetects best justification mode based on all class options
+}
+
+\newcommand*{\@tufte@citation@justification}{\@tufte@justification@autodetect}
+\define@choicekey*+[tufte]{common}{citation}[\@tufte@kvtext\@tufte@kvnum]{justified,raggedleft,raggedright,raggedouter,auto}[auto]{%
+  \ifcase\@tufte@kvnum\relax
+    \renewcommand*{\@tufte@citation@justification}{\justifying}% justified
+  \or
+    \renewcommand*{\@tufte@citation@justification}{\RaggedLeft}% ragged left
+  \or
+    \renewcommand*{\@tufte@citation@justification}{\RaggedRight}% ragged right
+  \or
+    \renewcommand*{\@tufte@citation@justification}{\@tufte@justification@outer}% ragged outer (flush right on verso pages, flush left on recto pages)
+  \or
+    \renewcommand*{\@tufte@citation@justification}{\@tufte@justification@autodetect}% autodetects best justification mode based on all class options
+  \fi
+}{%
+  \TufteWarningNL{Invalid option `#1` for citation key.\MessageBreak Must be one of: justified, raggedleft,\MessageBreak raggedright, raggedouter, auto}
+  \renewcommand*{\@tufte@citation@justification}{\@tufte@justification@autodetect}% autodetects best justification mode based on all class options
+}
+
+% The ``marginals`` key simultaneously sets the same justification for all marginal material
+\define@choicekey*+[tufte]{common}{marginals}[\@tufte@kvtext\@tufte@kvnum]{justified,raggedleft,raggedright,raggedouter,auto}[auto]{%
+  \ifcase\@tufte@kvnum\relax
+    \ExecuteOptionsX[tufte]<common>{citation=justified,sidenote=justified,caption=justified,marginnote=justified}% justified
+  \or
+    \ExecuteOptionsX[tufte]<common>{citation=raggedleft,sidenote=raggedleft,caption=raggedleft,marginnote=raggedleft}% ragged left
+  \or
+    \ExecuteOptionsX[tufte]<common>{citation=raggedright,sidenote=raggedright,caption=raggedright,marginnote=raggedright}% ragged right
+  \or
+    \ExecuteOptionsX[tufte]<common>{citation=raggedouter,sidenote=raggedouter,caption=raggedouter,marginnote=raggedouter}% ragged outer (flush right on verso pages, flush left on recto pages)
+  \or
+    \ExecuteOptionsX[tufte]<common>{citation=auto,sidenote=auto,caption=auto,marginnote=auto}% autodetects best justification mode based on all class options
+  \fi
+}{%
+  \TufteWarningNL{Invalid option `#1` for marginals key.\MessageBreak Must be one of: justified, raggedleft,\MessageBreak raggedright, raggedouter, auto}
+  \ExecuteOptionsX[tufte]<common>{citation=auto,sidenote=auto,caption=auto,marginnote=auto}% autodetects best justification mode based on all class options
+}
+
+
+%%
+% Unsupported options
+
+\newcommand{\@tufte@unsupported@option}[1]{\TufteWarningNL{Option `#1` is not supported -- \MessageBreak ignoring option}\OptionNotUsed}
+
+\DeclareOptionX[tufte]<common>{10pt}{\@tufte@unsupported@option{\CurrentOption}}
+\DeclareOptionX[tufte]<common>{11pt}{\@tufte@unsupported@option{\CurrentOption}}
+\DeclareOptionX[tufte]<common>{12pt}{\@tufte@unsupported@option{\CurrentOption}}
+\DeclareOptionX[tufte]<common>{a5paper}{\@tufte@unsupported@option{\CurrentOption}}
+\DeclareOptionX[tufte]<common>{executivepaper}{\@tufte@unsupported@option{\CurrentOption}}
+\DeclareOptionX[tufte]<common>{legalpaper}{\@tufte@unsupported@option{\CurrentOption}}
+\DeclareOptionX[tufte]<common>{landscape}{\@tufte@unsupported@option{\CurrentOption}}
+\DeclareOptionX[tufte]<common>{onecolumn}{\@tufte@unsupported@option{\CurrentOption}}
+\DeclareOptionX[tufte]<common>{twocolumn}{\@tufte@unsupported@option{\CurrentOption}}
+
+%%
+% Default `book` and `handout` options
+
+\ifthenelse{\equal{\@tufte@pkgname}{tufte-book}}
+  {\ExecuteOptionsX[tufte]<common>{titlepage}}
+  {\ExecuteOptionsX[tufte]<common>{notitlepage}}
+
+
+\DeclareOptionX*{%
+  \TufteInfoNL{Passing \CurrentOption\space to the `\@tufte@class` class.}%
+  \PassOptionsToClass{\CurrentOption}{\@tufte@class}%
+}
+\ProcessOptionsX*[tufte]<common>\relax
+
+%%
+% Load the appropriate base class
+\TufteInfoNL{Loading the base class `\@tufte@class`}
+\LoadClass{\@tufte@class}
+
+%%
+% Detect whether we`re in two-side mode or not.  (Used to set up running
+% heads later.)
+
+\ifthenelse{\boolean{@twoside}}
+  {\setboolean{@tufte@twoside}{true}}
+  {}
+
+
+
+%%
+% Detect if we`re using pdfLaTeX
+
+\newboolean{@tufte@pdf}
+\IfFileExists{ifpdf.sty}{%
+  \RequirePackage{ifpdf}
+  \ifthenelse{\boolean{pdf}}
+    {\setboolean{@tufte@pdf}{true}}
+    {\setboolean{@tufte@pdf}{false}}
+}{% assume we`re not using pdfTex?
+  \setboolean{@tufte@pdf}{false}
+}
+
+%%
+% Detect if we`re using XeLaTeX
+
+\newboolean{@tufte@xetex}
+\IfFileExists{ifxetex.sty}{%
+  \RequirePackage{ifxetex}
+  \ifthenelse{\boolean{xetex}}
+    {\setboolean{@tufte@xetex}{true}}
+    {\setboolean{@tufte@xetex}{false}}
+}{% not using xelatex
+  \setboolean{@tufte@xetex}{false}
+}
+
+%%
+% Globally sets the length
+
+\newcommand*{\gsetlength}[2]{%
+  \setlength{#1}{#2}%
+  \global#1=#1\relax%
+}
+
+%%
+% Globally sets a boolean
+
+\newcommand*{\gsetboolean}[2]{% based on code from ifthen pkg
+  \lowercase{\def\@tempa{#2}}%
+  \@ifundefined{@tempswa\@tempa}%
+    {\PackageError{ifthen}{You can only set a boolean to `true` or `false`}\@ehc}%
+    {\@ifundefined{#1\@tempa}%
+      {\PackageError{ifthen}{Boolean #1 undefined}\@ehc}%
+      {\global\csname#1\@tempa\endcsname}%
+    }%
+}
+
+%%
+% The titlesec and titletoc packages are used to change the style of the
+% section headings.  These packages should be loaded before the hyperref
+% package.
+
+\RequirePackage{titlesec,titletoc}
+
+%%%
+%% Loads the hyperref package and sets some default options.
+
+\newcommand{\TufteLoadHyperref}{%
+  \ifthenelse{\boolean{@tufte@xetex}}
+    {\RequirePackage[unicode,hyperfootnotes=false,xetex]{hyperref}}
+    {\RequirePackage[unicode,hyperfootnotes=false]{hyperref}}
+  \hypersetup{%
+    pdfborder = {0 0 0},
+    bookmarksdepth = section,
+    citecolor = DarkGreen,
+    linkcolor = DarkBlue,
+    pagecolor = DarkBlue,
+    urlcolor = DarkGreen,
+  }%
+}
+
+%%%
+%% Load the `hyperref` package.
+
+\ifthenelse{\boolean{@tufte@loadhyper}}{%
+  \TufteLoadHyperref%
+}{% hyperfootnotes override our modifications to the \footnote* and \@footnote* commands.
+  \PassOptionsToPackage{hyperfootnotes=false}{hyperref}
+}
+
+%%
+% Set the font sizes and baselines to match Tufte`s books
+\renewcommand\normalsize{%
+   \@setfontsize\normalsize\@xpt{14}%
+   \abovedisplayskip 10\p@ \@plus2\p@ \@minus5\p@
+   \abovedisplayshortskip \z@ \@plus3\p@
+   \belowdisplayshortskip 6\p@ \@plus3\p@ \@minus3\p@
+   \belowdisplayskip \abovedisplayskip
+   \let\@listi\@listI}
+\normalbaselineskip=14pt
+\normalsize
+\renewcommand\small{%
+   \@setfontsize\small\@ixpt{12}%
+   \abovedisplayskip 8.5\p@ \@plus3\p@ \@minus4\p@
+   \abovedisplayshortskip \z@ \@plus2\p@
+   \belowdisplayshortskip 4\p@ \@plus2\p@ \@minus2\p@
+   \def\@listi{\leftmargin\leftmargini
+               \topsep 4\p@ \@plus2\p@ \@minus2\p@
+               \parsep 2\p@ \@plus\p@ \@minus\p@
+               \itemsep \parsep}%
+   \belowdisplayskip \abovedisplayskip
+}
+\renewcommand\footnotesize{%
+   \@setfontsize\footnotesize\@viiipt{10}%
+   \abovedisplayskip 6\p@ \@plus2\p@ \@minus4\p@
+   \abovedisplayshortskip \z@ \@plus\p@
+   \belowdisplayshortskip 3\p@ \@plus\p@ \@minus2\p@
+   \def\@listi{\leftmargin\leftmargini
+               \topsep 3\p@ \@plus\p@ \@minus\p@
+               \parsep 2\p@ \@plus\p@ \@minus\p@
+               \itemsep \parsep}%
+   \belowdisplayskip \abovedisplayskip
+}
+\renewcommand\scriptsize{\@setfontsize\scriptsize\@viipt\@viiipt}
+\renewcommand\tiny{\@setfontsize\tiny\@vpt\@vipt}
+\renewcommand\large{\@setfontsize\large\@xipt{15}}
+\renewcommand\Large{\@setfontsize\Large\@xiipt{16}}
+\renewcommand\LARGE{\@setfontsize\LARGE\@xivpt{18}}
+\renewcommand\huge{\@setfontsize\huge\@xxpt{30}}
+\renewcommand\Huge{\@setfontsize\Huge{24}{36}}
+
+\setlength\leftmargini   {1pc}
+\setlength\leftmarginii  {1pc}
+\setlength\leftmarginiii {1pc}
+\setlength\leftmarginiv  {1pc}
+\setlength\leftmarginv   {1pc}
+\setlength\leftmarginvi  {1pc}
+\setlength\labelsep      {.5pc}
+\setlength\labelwidth    {\leftmargini}
+\addtolength\labelwidth{-\labelsep}
+
+%%
+% \RaggedRight allows hyphenation
+
+\RequirePackage{ragged2e}
+\setlength{\RaggedRightRightskip}{\z@ plus 0.08\hsize}
+\setlength{\RaggedRightParindent}{1pc}
+
+% Paragraph indentation and separation for normal text
+\newcommand{\@tufte@reset@par}{%
+  \setlength{\RaggedRightParindent}{1.0pc}%
+  \setlength{\parindent}{1pc}%
+  \setlength{\parskip}{0pt}%
+}
+\@tufte@reset@par
+
+% Paragraph indentation and separation for marginal text
+\newcommand{\@tufte@margin@par}{%
+  \setlength{\RaggedRightParindent}{0.5pc}%
+  \setlength{\parindent}{0.5pc}%
+  \setlength{\parskip}{0pt}%
+}
+
+
+%%
+% Set page layout geometry
+
+\RequirePackage[letterpaper,left=1in,top=1in,headsep=2\baselineskip,textwidth=26pc,marginparsep=2pc,marginparwidth=12pc,textheight=44\baselineskip,headheight=\baselineskip]{geometry}
+
+\ifthenelse{\boolean{@tufte@afourpaper}}
+  {\geometry{a4paper,left=24.8mm,top=27.4mm,headsep=2\baselineskip,textwidth=107mm,marginparsep=8.2mm,marginparwidth=49.4mm,textheight=49\baselineskip,headheight=\baselineskip}}
+  {}
+
+\ifthenelse{\boolean{@tufte@bfivepaper}}
+  {\geometry{paperwidth=176mm,paperheight=250mm,left=14.66mm,top=13.88mm,textwidth=102.66mm,marginparsep=7.33mm,marginparwidth=36.66mm,textheight=38\baselineskip,includehead}}
+  {}
+
+\ifthenelse{\boolean{@tufte@symmetric}}
+  {}
+  {\geometry{asymmetric}}% forces internal LaTeX `twoside`
+
+
+%%
+% Separation marginpars by a line`s worth of space.
+
+\setlength\marginparpush{10pt}
+
+%%
+% Font for margin items
+
+\ifthenelse{\boolean{@tufte@sfsidenotes}}
+  {\newcommand{\@tufte@marginfont}{\normalfont\footnotesize\sffamily}}
+  {\newcommand{\@tufte@marginfont}{\normalfont\footnotesize}}
+
+\newcommand*{\@tufte@sidenote@font}{\@tufte@marginfont}
+\newcommand*{\@tufte@caption@font}{\@tufte@marginfont}
+\newcommand*{\@tufte@marginnote@font}{\@tufte@marginfont}
+\newcommand*{\@tufte@citation@font}{\@tufte@marginfont}
+
+\newcommand*{\setsidenotefont}[1]{\renewcommand*{\@tufte@sidenote@font}{#1}}
+\newcommand*{\setcaptionfont}[1]{\renewcommand*{\@tufte@caption@font}{#1}}
+\newcommand*{\setmarginnotefont}[1]{\renewcommand*{\@tufte@marginnote@font}{#1}}
+\newcommand*{\setcitationfont}[1]{\renewcommand*{\@tufte@citation@font}{#1}}
+
+%%
+% Set the justification baesed on the `justified` class option
+
+\newcommand{\@tufte@justification}{%
+  \ifthenelse{\boolean{@tufte@justified}}%
+    {\justifying}%
+    {\RaggedRight}%
+}
+
+%%
+% Turn off section numbering
+
+\setcounter{secnumdepth}{-1}
+
+%%
+% Tighten up space between displays (e.g., a figure or table) and make symmetric
+
+\setlength\abovedisplayskip{6pt plus 2pt minus 4pt}
+\setlength\belowdisplayskip{6pt plus 2pt minus 4pt}
+
+%%
+% To implement full-width display environments
+
+\newboolean{@tufte@changepage}
+\IfFileExists{changepage.sty}{%
+  \TufteDebugInfoNL{Found changepage.sty}
+  \RequirePackage[strict]{changepage}
+  \setboolean{@tufte@changepage}{true}
+}{%
+  \TufteDebugInfoNL{Found chngpage.sty}
+  \RequirePackage[strict]{chngpage}
+  \setboolean{@tufte@changepage}{false}
+}
+
+% Write our own aliases for the \checkoddpage and \ifoddpage or \ifcpoddpage commands
+\newboolean{@tufte@odd@page}
+\setboolean{@tufte@odd@page}{true}
+\newcommand*{\@tufte@checkoddpage}{%
+  \checkoddpage%
+  \ifthenelse{\boolean{@tufte@changepage}}{%
+    \ifoddpage%
+      \setboolean{@tufte@odd@page}{true}%
+    \else%
+      \setboolean{@tufte@odd@page}{false}%
+    \fi%
+  }{%
+    \ifcpoddpage%
+      \setboolean{@tufte@odd@page}{true}%
+    \else%
+      \setboolean{@tufte@odd@page}{false}%
+    \fi%
+  }%
+}
+
+%%
+% Compute lengths used for full-width displays
+
+\newlength{\@tufte@overhang}% used by the fullwidth environment and the running heads
+\newlength{\@tufte@fullwidth}
+\newlength{\@tufte@caption@fill}
+
+\newcommand{\TufteRecalculate}{%
+  \setlength{\@tufte@overhang}{\marginparwidth}
+  \addtolength{\@tufte@overhang}{\marginparsep}
+
+  \setlength{\@tufte@fullwidth}{\textwidth}
+  \addtolength{\@tufte@fullwidth}{\marginparsep}
+  \addtolength{\@tufte@fullwidth}{\marginparwidth}
+
+  \setlength{\@tufte@caption@fill}{\textwidth}
+  \addtolength{\@tufte@caption@fill}{\marginparsep}
+}
+
+\AtBeginDocument{\TufteRecalculate}
+
+%%
+% Modified \title, \author, and \date commands.  These store the
+% (footnote-less) values in \plaintitle, \plainauthor, and \thedate, respectively.
+
+\newcommand{\plaintitle}{}%     plain-text-only title
+\newcommand{\plainauthor}{}%    plain-text-only author
+\newcommand{\plainpublisher}{}% plain-text-only publisher
+
+\newcommand{\thanklesstitle}{}%     full title text minus \thanks{}
+\newcommand{\thanklessauthor}{}%    full author text minus \thanks{}
+\newcommand{\thanklesspublisher}{}% full publisher minus \thanks{}
+
+\newcommand{\@publisher}{}% full publisher with \thanks{}
+\newcommand{\thedate}{\today}
+
+% TODO Fix it so that \thanks is not spaced out (with `soul`) and can be
+% used in \maketitle when the `sfsidenotes` option is provided.
+\renewcommand{\thanks}[1]{\NoCaseChange{\footnote{#1}}}
+
+\renewcommand{\title}[2][]{%
+  \gdef\@title{#2}%
+  \begingroup%
+    % TODO store contents of \thanks command
+    \renewcommand{\thanks}[1]{}% swallow \thanks contents
+    \protected@xdef\thanklesstitle{#2}%
+  \endgroup%
+  \ifthenelse{\isempty{#1}}%
+    {\renewcommand{\plaintitle}{\thanklesstitle}}% use thankless title
+    {\renewcommand{\plaintitle}{#1}}% use provided plain-text title
+  \@ifpackageloaded{hyperref}{\hypersetup{pdftitle={\plaintitle}}}{}% set the PDF metadata title
+}
+
+\def\@author{}% default author is empty (suppresses LaTeX`s ``no author`` warning)
+\renewcommand*{\author}[2][]{%
+  \gdef\@author{#2}%
+  \begingroup%
+    % TODO store contents of \thanks command
+    \renewcommand{\thanks}[1]{}% swallow \thanks contents
+    \protected@xdef\thanklessauthor{#2}%
+  \endgroup%
+  \ifthenelse{\isempty{#1}}
+    {\renewcommand{\plainauthor}{\thanklessauthor}}% use thankless author
+    {\renewcommand{\plainauthor}{#1}}% use provided plain-text author
+  \@ifpackageloaded{hyperref}{\hypersetup{pdfauthor={\plainauthor}}}{}% set the PDF metadata author
+}
+
+\renewcommand*{\date}[1]{%
+  \gdef\@date{#1}%
+  \begingroup%
+    % TODO store contents of \thanks command
+    \renewcommand{\thanks}[1]{}% swallow \thanks contents
+    \protected@xdef\thedate{#1}%
+  \endgroup%
+}
+
+%%
+% Provides a \publisher command to set the publisher
+
+\newcommand{\publisher}[2][]{%
+  \gdef\@publisher{#2}%
+  \begingroup%
+    \renewcommand{\thanks}[1]{}% swallow \thanks contents
+    \protected@xdef\thanklesspublisher{#2}%
+  \endgroup%
+  \ifthenelse{\isempty{#1}}
+    {\renewcommand{\plainpublisher}{\thanklesspublisher}}% use thankless publisher
+    {\renewcommand{\plainpublisher}{#1}}% use provided plain-text publisher
+}
+
+% TODO: Test \hypersetup{pdfauthor,pdftitle} with DVI and XeTeX
+
+%%
+% Require paralist package for tighter lists
+
+\RequirePackage{paralist}
+
+% Add rightmargin to compactenum
+
+\def\@compactenum@{%
+  \expandafter\list\csname label\@enumctr\endcsname{%
+    \usecounter{\@enumctr}%
+    \rightmargin=2em% added this
+    \parsep\plparsep
+    \itemsep\plitemsep
+    \topsep\pltopsep
+    \partopsep\plpartopsep
+    \def\makelabel##1{\hss\llap{##1}}}}
+
+%%
+% Improved letterspacing of small caps and all-caps text.
+%
+% First, try to use the `microtype` package, if it`s available. 
+% Failing that, try to use the `soul` package, if it`s available.
+% Failing that, well, I give up.
+
+\DeclareTextFontCommand{\textsmallcaps}{\scshape}
+
+\RequirePackage{textcase} % provides \MakeTextUppercase and \MakeTextLowercase
+\def\allcapsspacing{\TufteWarning{Proper spacing of ALL-CAPS letters has not been set up.}}
+\def\smallcapsspacing{\TufteWarning{Proper spacing of small-caps letters has not been set up.}}
+\newcommand{\allcaps}[1]{\allcapsspacing{\MakeTextUppercase{#1}}}
+\newcommand{\smallcaps}[1]{\smallcapsspacing{\MakeTextLowercase{#1}}}
+
+% If we`re using pdfLaTeX v1.40+, use the letterspace package. 
+% If we`re using pdfLaTex < v1.40, use the soul package.
+% If we`re using XeLaTeX, use XeLaTeX letterspacing options.
+% Otherwise fall back on the soul package.
+
+\ifthenelse{\boolean{@tufte@pdf}}
+  {\TufteDebugInfoNL{ifpdf = true}}
+  {\TufteDebugInfoNL{ifpdf = false}}
+
+\ifthenelse{\boolean{@tufte@xetex}}
+  {\TufteDebugInfoNL{ifxetex = true}}
+  {\TufteDebugInfoNL{ifxetex = false}}
+
+% Check pdfLaTeX version
+\def\@tufte@pdftexversion{0}
+\ifx\normalpdftexversion\@undefined \else
+  \let\pdftexversion \normalpdftexversion
+  \let\pdftexrevision\normalpdftexrevision
+  \let\pdfoutput     \normalpdfoutput
+\fi
+\ifx\pdftexversion\@undefined \else
+  \ifx\pdftexversion\relax \else
+    \def\@tufte@pdftexversion{6}
+    \ifnum\pdftexversion < 140
+      \def\@tufte@pdftexversion{5}
+    \fi
+  \fi
+\fi
+
+\newboolean{@tufte@letterspace@pkg@prereqs}
+\setboolean{@tufte@letterspace@pkg@prereqs}{true}
+\ifnum\@tufte@pdftexversion<6
+  \setboolean{@tufte@letterspace@pkg@prereqs}{false}
+\fi
+
+
+\ifthenelse{\boolean{@tufte@letterspace}}{%
+  \ifthenelse{\boolean{@tufte@pdf}\AND\boolean{@tufte@letterspace@pkg@prereqs}\AND\NOT\boolean{@tufte@xetex}}{%
+    % load letterspace pkg
+    \IfFileExists{letterspace.sty}{%
+      \TufteDebugInfoNL{Modern version of pdfTeX detected. \MessageBreak Using `letterspace` package}
+      \RequirePackage{letterspace}
+      % Set up letterspacing (using microtype package) -- requires pdfTeX v1.40+
+      \renewcommand{\allcapsspacing}[1]{\textls[200]{##1}}
+      \renewcommand{\smallcapsspacing}[1]{\textls[50]{##1}}
+      \renewcommand{\allcaps}[1]{\textls[200]{\MakeTextUppercase{##1}}}
+      \renewcommand{\smallcaps}[1]{\smallcapsspacing{\scshape\MakeTextLowercase{##1}}}
+      \renewcommand{\textsc}[1]{\smallcapsspacing{\textsmallcaps{##1}}}
+    }{}%
+  }{}%
+  % load soul pkg
+  \@ifpackageloaded{letterspace}{}{%
+    \IfFileExists{soul.sty}{%
+      \RequirePackage{soul}
+      \sodef\allcapsspacing{}{0.15em}{0.65em}{0.6em}
+      \sodef\smallcapsspacing{}{0.075em}{0.5em}{0.6em}
+      \sodef\sotextsc{\scshape}{0.075em}{0.5em}{0.6em}
+      \renewcommand{\allcaps}[1]{\allcapsspacing{\MakeTextUppercase{##1}}}
+      \renewcommand{\smallcaps}[1]{\smallcapsspacing{\scshape\MakeTextLowercase{##1}}}
+      \renewcommand{\textsc}[1]{\sotextsc{##1}}
+    }{
+      \TufteWarningNL{Couldn`t locate `soul` package}
+    }% soul not installed... giving up.
+  }%
+}{}
+
+%\ifthenelse{\boolean{@tufte@letterspace}}{%
+  %\ifthenelse{\boolean{pdf}}{%
+    %\ifthenelse{\NOT\boolean{@tufte@letterspace@pkg@prereqs}}{%
+      %% pdfLaTeX version is too old or not using pdfLaTeX
+      %\ifthenelse{\boolean{@tufte@xetex}}{%
+        %% TODO use xetex letterspacing
+        %\TufteDebugInfoNL{XeTeX detected. \MessageBreak Reverting to `soul` package for letterspacing}%
+        %\@tufte@loadsoul%
+      %}{%
+        %% use `soul` package for letterspacing
+        %\TufteDebugInfoNL{Old version of pdfTeX detected. \MessageBreak Reverting to `soul` package for letterspacing}%
+        %\@tufte@loadsoul%
+      %}
+    %}{%
+      %\IfFileExists{letterspace.sty}{%
+        %\TufteDebugInfoNL{Modern version of pdfTeX detected. \MessageBreak Using `letterspace` package}
+        %\RequirePackage{letterspace}
+        %% Set up letterspacing (using microtype package) -- requires pdfTeX v1.40+
+        %\renewcommand{\allcapsspacing}[1]{\textls[200]{##1}}
+        %\renewcommand{\smallcapsspacing}[1]{\textls[50]{##1}}
+        %\renewcommand{\allcaps}[1]{\textls[200]{\MakeTextUppercase{##1}}}
+        %\renewcommand{\smallcaps}[1]{\smallcapsspacing{\MakeTextLowercase{##1}}}
+        %\renewcommand{\textsc}[1]{\smallcapsspacing{\textsmallcaps{##1}}}
+      %}{% microtype failed, check for soul
+        %\TufteDebugInfoNL{Modern version of pdfTeX detected, but `letterspace` \MessageBreak package not installed.  \MessageBreak Reverting to  `soul` package for letterspacing}
+        %\@tufte@loadsoul
+      %}%
+    %}%
+  %}{%
+    %\TufteDebugInfoNL{Plain LaTeX detected. \MessageBreak Using `soul` package for letterspacing}
+    %\@tufte@loadsoul
+  %}
+%}{%
+%% we`re not to load letterspacing, so do nothing
+%}
+
+
+%%
+% An environment for paragraph-style section
+
+\providecommand\newthought[1]{%
+   \addvspace{1.0\baselineskip plus 0.5ex minus 0.2ex}%
+   \noindent\textsc{#1}%
+}
+
+%%
+% Redefine the display environments (quote, quotation, etc.)
+
+\renewenvironment{verse}
+               {\let\\\@centercr
+                \list{}{\itemsep      \z@
+                        \itemindent   -1pc%
+                        \listparindent\itemindent
+                        \rightmargin  \leftmargin
+                        \advance\leftmargin 1pc}%
+                \small%
+                \item\relax}
+               {\endlist}
+\renewenvironment{quotation}
+               {\list{}{\listparindent 1pc%
+                        \itemindent    \listparindent
+                        \rightmargin   \leftmargin
+                        \parsep        \z@ \@plus\p@}%
+                \small%
+                \item\relax\noindent\ignorespaces}
+               {\endlist}
+\renewenvironment{quote}
+               {\list{}{\rightmargin\leftmargin}%
+                \small%
+                \item\relax}
+               {\endlist}
+
+%%
+% Italicize description run-in headings (instead of the default bold)
+
+\renewcommand*\descriptionlabel[1]{\hspace\labelsep\normalfont\em #1}
+
+
+%%
+% Used for doublespacing, and other linespacing
+
+\RequirePackage{setspace}
+
+%%
+% Load the bidi package if instructed to do so.  This package must be loaded
+% prior to our redefining the \footnote and \cite commands.
+
+\ifthenelse{\boolean{@tufte@loadbidi}}{\RequirePackage{bidi}}{}
+
+
+%%
+% A function that removes leading and trailling spaces from the supplied macro.
+% Based on code written by Michael Downes (See ``Around the Bend``, #15.)
+% Executing \@tufte@trim@spaces\xyzzy will result in the contents of \xyzzy
+% being trimmed of leading and trailing white space.
+
+\catcode`\Q=3
+\def\@tufte@trim@spaces#1{%
+  % Use grouping to emulate a multi-token afterassignment queue
+  \begingroup%
+  % Put `\toks 0 {` into the afterassignment queue
+  \aftergroup\toks\aftergroup0\aftergroup{% 
+  % Apply \trimb to the replacement text of #1, adding a leading
+  % \noexpand to prevent brace stripping and to serve another purpose
+  % later.
+  \expandafter\@tufte@trim@b\expandafter\noexpand#1Q Q}%
+  % Transfer the trimmed text back into #1.
+  \edef#1{\the\toks0}%
+}
+
+% \trimb removes a trailing space if present, then calls \@tufte@trim@c to
+% clean up any leftover bizarre Qs, and trim a leading space. In
+% order for \trimc to work properly we need to put back a Q first.
+\def\@tufte@trim@b#1 Q{\@tufte@trim@c#1Q}
+
+% Execute \vfuzz assignment to remove leading space; the \noexpand
+% will now prevent unwanted expansion of a macro or other expandable
+% token at the beginning of the trimmed text. The \endgroup will feed
+% in the \aftergroup tokens after the \vfuzz assignment is completed.
+\def\@tufte@trim@c#1Q#2{\afterassignment\endgroup \vfuzz\the\vfuzz#1}
+\catcode`\Q=11
+
+%%
+% Citations should go in the margin as sidenotes
+
+\RequirePackage{natbib}
+\RequirePackage{bibentry}        % allows bibitems to be typeset outside thebibliography environment
+% Redefine the \BR@b@bibitem command to fix a bug with bibentry+chicago style
+\renewcommand\BR@b@bibitem[2][]{%
+  \ifthenelse{\isempty{#1}}%
+    {\BR@bibitem{#2}}%
+    {\BR@bibitem[#1]{#2}}%
+  \BR@c@bibitem{#2}%
+}
+\nobibliography*                % pre-loads the bibliography keys
+\providecommand{\doi}[1]{\textsc{doi:} #1}% pre-defining this so it may be used before the \bibliography command it issued
+
+%%
+% Normal \cite behavior
+\newcounter{@tufte@num@bibkeys}%
+\newcommand{\@tufte@normal@cite}[2][0pt]{%
+  % Snag the last bibentry in the list for later comparison
+  \let\@temp@last@bibkey\@empty%
+  \@for\@temp@bibkey:=#2\do{\let\@temp@last@bibkey\@temp@bibkey}%
+  \sidenote[][#1]{%
+    % Loop through all the bibentries, separating them with semicolons and spaces
+    \normalsize\normalfont\@tufte@citation@font%
+    \setcounter{@tufte@num@bibkeys}{0}%
+    \@for\@temp@bibkeyx:=#2\do{%
+      \ifthenelse{\equal{\@temp@last@bibkey}{\@temp@bibkeyx}}%
+        {\ifthenelse{\equal{\value{@tufte@num@bibkeys}}{0}}{}{and\ }%
+         \@tufte@trim@spaces\@temp@bibkeyx% trim spaces around bibkey
+         \bibentry{\@temp@bibkeyx}}%
+        {\@tufte@trim@spaces\@temp@bibkeyx% trim spaces around bibkey
+         \bibentry{\@temp@bibkeyx};\ }%
+      \stepcounter{@tufte@num@bibkeys}%
+    }%
+  }%
+}
+
+
+%%
+% Macros for holding the list of cite keys until after the \sidenote
+
+\gdef\@tufte@citations{}% list of cite keys
+\newcommand\@tufte@add@citation[1]{\relax% adds a new bibkey to the list of cite keys
+  \ifx\@tufte@citations\@empty\else
+    \g@addto@macro\@tufte@citations{,}% separate by commas
+  \fi
+  \g@addto@macro\@tufte@citations{#1}
+}
+
+\newcommand{\@tufte@print@citations}[1][0pt]{% puts the citations in a margin note
+  % Snag the last bibentry in the list for later comparison
+  \let\@temp@last@bibkey\@empty%
+  \@for\@temp@bibkey:=\@tufte@citations\do{\let\@temp@last@bibkey\@temp@bibkey}%
+  \marginpar{%
+    \hbox{}\vspace*{#1}%
+    \@tufte@citation@font%
+    \@tufte@citation@justification%
+    \@tufte@margin@par% use parindent and parskip settings for marginal text
+    \vspace*{-1\baselineskip}%
+    % Loop through all the bibentries, separating them with semicolons and spaces
+    \setcounter{@tufte@num@bibkeys}{0}%
+    \@for\@temp@bibkeyx:=\@tufte@citations\do{%
+      \ifthenelse{\equal{\@temp@last@bibkey}{\@temp@bibkeyx}}%
+        {\ifthenelse{\equal{\value{@tufte@num@bibkeys}}{0}}{}{and\ }%
+         \@tufte@trim@spaces\@temp@bibkeyx% trim spaces around bibkey
+         \bibentry{\@temp@bibkeyx}}%
+        {\@tufte@trim@spaces\@temp@bibkeyx% trim spaces around bibkey
+         \bibentry{\@temp@bibkeyx};\ }%
+      \stepcounter{@tufte@num@bibkeys}%
+    }%
+    \@tufte@reset@par% use parindent and parskip settings for body text
+  }%
+}
+
+%%
+% \cite behavior when executed within a sidenote
+
+\newcommand{\@tufte@sidenote@citations}{}% contains list of \cites in sidenote
+\newcommand{\@tufte@infootnote@cite}[1]{%
+  \@tufte@add@citation{#1}
+}
+
+%%
+% Set the default \cite style.  This is set and reset by the \sidenote command.
+
+\let\cite\@tufte@normal@cite
+
+%%
+% Transform existing \footnotes into \sidenotes
+% Sidenote: ``Where God meant footnotes to go.`` ---Tufte
+
+\RequirePackage{optparams}% for our new sidenote commands -- provides multiple optional arguments for commands
+
+\providecommand*{\footnotelayout}{\@tufte@sidenote@font\@tufte@sidenote@justification}
+\renewcommand{\footnotelayout}{\@tufte@sidenote@font\@tufte@sidenote@justification}
+
+% Override footmisc`s definition to set the sidenote marks (numbers) inside the
+% sidenote`s text block.
+\long\def\@makefntext#1{\@textsuperscript{\@tufte@sidenote@font\tiny\@thefnmark}\,\footnotelayout#1}
+
+% Set the in-text footnote mark in the same typeface as the body text itself.
+\def\@makefnmark{\hbox{\@textsuperscript{\normalfont\footnotesize\@thefnmark}}}
+
+\providecommand*{\multiplefootnotemarker}{3sp}
+\providecommand*{\multfootsep}{,}
+
+\renewcommand*\@footnotemark{%
+  \leavevmode%
+  \ifhmode%
+    \edef\@x@sf{\the\spacefactor}%
+    \@tufte@check@multiple@sidenotes%
+    \nobreak%
+  \fi%
+  \@makefnmark%
+  \ifhmode\spacefactor\@x@sf\fi%
+  \relax%
+}
+
+\newcommand{\@tufte@check@multiple@sidenotes}{%
+  \ifdim\lastkern=\multiplefootnotemarker\relax%
+    \edef\@x@sf{\the\spacefactor}%
+    \unkern%
+    \textsuperscript{\multfootsep}%
+    \spacefactor\@x@sf\relax%
+  \fi
+}
+
+\renewcommand\@footnotetext[2][0pt]{%
+  \marginpar{%
+    \hbox{}\vspace*{#1}%
+    \def\baselinestretch {\setspace@singlespace}%
+    \ifthenelse{\boolean{@tufte@loadbidi}}{\if@rl@footnote\@rltrue\else\@rlfalse\fi}{}%
+    \reset@font\footnotesize%
+    \@tufte@margin@par% use parindent and parskip settings for marginal text
+    \vspace*{-1\baselineskip}\noindent%
+    \protected@edef\@currentlabel{%
+       \csname p@footnote\endcsname\@thefnmark%
+    }%
+    \color@begingroup%
+       \@makefntext{%
+         \ignorespaces#2%
+       }%
+    \color@endgroup%
+  }%
+  \@tufte@reset@par% use parindent and parskip settings for body text
+}%
+
+%
+% Define \sidenote command.  Can handle \cite.
+
+\newlength{\@tufte@sidenote@vertical@offset}
+\setlength{\@tufte@sidenote@vertical@offset}{0pt}
+
+% #1 = footnote num, #2 = vertical offset, #3 = footnote text
+\long\def\@tufte@sidenote[#1][#2]#3{%
+  \let\cite\@tufte@infootnote@cite%   use the in-sidenote \cite command
+  \gdef\@tufte@citations{}%           clear out any old citations
+  \ifthenelse{\NOT\isempty{#2}}{%
+    \gsetlength{\@tufte@sidenote@vertical@offset}{#2}%
+  }{%
+    \gsetlength{\@tufte@sidenote@vertical@offset}{0pt}%
+  }%
+  \ifthenelse{\isempty{#1}}{%
+    % no specific footnote number provided
+    \stepcounter\@mpfn%
+    \protected@xdef\@thefnmark{\thempfn}%
+    \@footnotemark\@footnotetext[\@tufte@sidenote@vertical@offset]{#3}%
+  }{%
+    % specific footnote number provided
+    \begingroup%
+      \csname c@\@mpfn\endcsname #1\relax%
+      \unrestored@protected@xdef\@thefnmark{\thempfn}%
+    \endgroup%
+    \@footnotemark\@footnotetext[\@tufte@sidenote@vertical@offset]{#3}%
+  }%
+  \@tufte@print@citations%            print any citations
+  \let\cite\@tufte@normal@cite%       go back to using normal in-text \cite command
+  \unskip\ignorespaces%               remove extra white space
+  \kern-\multiplefootnotemarker%      remove \kern left behind by sidenote
+  \kern\multiplefootnotemarker\relax% add new \kern here to replace the one we yanked
+}
+
+\newcommand*{\sidenote}{\optparams{\@tufte@sidenote}{[][0pt]}}
+\renewcommand*{\footnote}{\optparams{\@tufte@sidenote}{[][0pt]}}
+
+%%
+% Sidenote without the footnote mark
+
+\newcommand\marginnote[2][0pt]{%
+  \let\cite\@tufte@infootnote@cite%   use the in-sidenote \cite command
+  \gdef\@tufte@citations{}%           clear out any old citations
+  \@tufte@margin@par%                 use parindent and parskip settings for marginal text
+  \marginpar{\hbox{}\vspace*{#1}\@tufte@marginnote@font\@tufte@marginnote@justification\vspace*{-1\baselineskip}\noindent #2}%
+  \@tufte@reset@par%                  use parindent and parskip settings for body text
+  \@tufte@print@citations%            print any citations
+  \let\cite\@tufte@normal@cite%       go back to using normal in-text \cite command
+}
+
+
+%%
+% The placeins package provides the \FloatBarrier command.  This forces
+% LaTeX to place all of the floats before proceeding.  We`ll use this to
+% keep the float (figure and table) numbers in sequence.
+\RequirePackage{placeins}
+
+%%
+% Margin float environment
+
+\newsavebox{\@tufte@margin@floatbox}
+\newenvironment{@tufte@margin@float}[2][-1.2ex]%
+  {\FloatBarrier% process all floats before this point so the figure/table numbers stay in order.
+  \begin{lrbox}{\@tufte@margin@floatbox}%
+  \begin{minipage}{\marginparwidth}%
+    \@tufte@caption@font%
+    \def\@captype{#2}%
+    \hbox{}\vspace*{#1}%
+    \@tufte@caption@justification%
+    \@tufte@margin@par%
+    \noindent%
+  }
+  {\end{minipage}%
+  \end{lrbox}%
+  \marginpar{\usebox{\@tufte@margin@floatbox}}%
+  \@tufte@reset@par%
+  }
+
+
+%%
+% Margin figure environment
+
+\newenvironment{marginfigure}[1][-1.2ex]%
+  {\begin{@tufte@margin@float}[#1]{figure}}
+  {\end{@tufte@margin@float}}
+
+
+%%
+% Margin table environment
+
+\newenvironment{margintable}[1][-1.2ex]%
+  {\begin{@tufte@margin@float}[#1]{table}}
+  {\end{@tufte@margin@float}}
+
+
+%%
+% Auto-detects the proper text alignment based on the various class options
+
+\newcommand*{\@tufte@justification@autodetect}{%
+  \ifthenelse{\boolean{@tufte@justified}}%
+    {\justifying}%
+    {\RaggedRight}%
+}
+
+%%
+% Forces the outer edge of the caption to be set ragged.  
+% Therefore, on verso pages it`s ragged left, and on recto pages it`s ragged right.
+
+\newcommand*{\@tufte@justification@caption@outer}{%
+  \ifthenelse{\boolean{@tufte@float@recto}}%
+    {\RaggedRight}%
+    {\RaggedLeft}%
+}
+
+\newcommand*{\@tufte@justification@outer}{%
+  \@tufte@checkoddpage%
+  \ifthenelse{\boolean{@tufte@odd@page}}%
+    {\RaggedRight}%
+    {\RaggedLeft}%
+}
+
+
+
+%%
+% A collection of macros to be used with the new Tufte-style float environments.
+% \setfloatalignment forces the caption placement to be treated as top, bottom, etc.
+% \forcerectofloat forces the float to be treated as if it were appearing on a recto page.
+% \forceversofloat does the same, but for verso pages.
+
+\newcommand{\@tufte@float@debug@info}{}% contains debug info generated as the float is processed
+\newcommand{\@tufte@float@debug}[1]{% adds debug info to the queue for output
+\ifthenelse{\equal{\@tufte@float@debug@info}{}}%
+    {\def\@tufte@float@debug@info{#1}}%
+    {\g@addto@macro\@tufte@float@debug@info{\MessageBreak#1}}
+}
+
+\newcommand{\floatalignment}{x}% holds the current float alignment (t, b, h, p)
+\newcommand{\setfloatalignment}[1]{\global\def\floatalignment{#1}\@tufte@float@debug{Forcing position: [#1]}}% manually sets the float alignment
+\newboolean{@tufte@float@recto}
+\newcommand{\forcerectofloat}{\gsetboolean{@tufte@float@recto}{true}\@tufte@float@debug{Forcing page: [recto]}}
+\newcommand{\forceversofloat}{\gsetboolean{@tufte@float@recto}{false}\@tufte@float@debug{Forcing page: [verso]}}
+
+% Boxes to temporarily store our float and caption
+\newsavebox{\@tufte@figure@box}
+\newsavebox{\@tufte@caption@box}
+
+% Save original LaTeX float environment
+\let\@tufte@orig@float\@float
+\let\@tufte@orig@endfloat\end@float
+
+% New length for tweaking float captions
+\newlength{\@tufte@caption@vertical@offset}
+\setlength{\@tufte@caption@vertical@offset}{0pt}
+
+% Store the caption and label contents
+\newcommand{\@tufte@stored@shortcaption}{}
+\newcommand{\@tufte@stored@caption}{}
+\newcommand{\@tufte@stored@label}{}
+
+\long\def\@tufte@caption[#1][#2]#3{%
+  \ifthenelse{\isempty{#1}}%
+    {\gdef\@tufte@stored@shortcaption{#3}}%
+    {\gdef\@tufte@stored@shortcaption{#1}}%
+  \gsetlength{\@tufte@caption@vertical@offset}{-#2}% we want a positive offset to lower captions
+  \gdef\@tufte@stored@caption{#3}%
+}
+
+\newcommand{\@tufte@label}[1]{%
+  \gdef\@tufte@stored@label{#1}%
+}
+
+\newcommand{\@tufte@fps}{}
+
+\newboolean{@tufte@float@star}
+\newlength{\@tufte@float@contents@width}
+
+%%
+% Define a float environment to place the captions in the margin space
+
+\newenvironment{@tufte@float}[3][htbp]%
+  {% begin @tufte@float
+    % Should this float be full-width or just text-width?
+    \ifthenelse{\equal{#3}{star}}%
+      {\gsetboolean{@tufte@float@star}{true}}%
+      {\gsetboolean{@tufte@float@star}{false}}%
+    % Check page side (recto/verso) and store detected value -- can be overriden in environment contents
+    \@tufte@checkoddpage%
+    \ifthenelse{\boolean{@tufte@odd@page}}%
+      {\gsetboolean{@tufte@float@recto}{true}\@tufte@float@debug{Detected page: [recto/odd]}}%
+      {\gsetboolean{@tufte@float@recto}{false}\@tufte@float@debug{Detected page: [verso/even]}}%
+    % If the float placement specifier is `b` and only `b`, then bottom-align the mini-pages, otherwise top-align them.
+    \renewcommand{\@tufte@fps}{#1}%
+    \@tufte@float@debug{Allowed positions: [#1]}
+    \ifthenelse{\equal{#1}{b}\OR\equal{#1}{B}}%
+      {\renewcommand{\floatalignment}{b}\@tufte@float@debug{Presumed position: [bottom]}}%
+      {\renewcommand{\floatalignment}{t}\@tufte@float@debug{Presumed position: [top]}}%
+    % Capture the contents of the \caption and \label commands to use later
+    \global\let\@tufte@orig@caption\caption%
+    \global\let\@tufte@orig@label\label%
+    \renewcommand{\caption}{\optparams{\@tufte@caption}{[][0pt]}}%
+    \renewcommand{\label}[1]{\@tufte@label{##1}}%
+    % Handle subfigure package compatibility
+    \ifthenelse{\boolean{@tufte@packages@subfigure}}{%
+      % don`t move the label while inside a \subfigure or \subtable command
+      \global\let\label\@tufte@orig@label%
+    }{}% subfigure package is not loaded
+    \@tufte@orig@float{#2}[#1]%
+    \ifthenelse{\boolean{@tufte@float@star}}%
+      {\setlength{\@tufte@float@contents@width}{\@tufte@fullwidth}}%
+      {\setlength{\@tufte@float@contents@width}{\textwidth}}%
+    \begin{lrbox}{\@tufte@figure@box}%
+      \begin{minipage}[\floatalignment]{\@tufte@float@contents@width}\hbox{}%
+  }{% end @tufte@float
+      \par\hbox{}\vspace{-\baselineskip}\ifthenelse{\prevdepth>0}{\vspace{-\prevdepth}}{}% align baselines of boxes
+      \end{minipage}%
+    \end{lrbox}%
+    % build the caption box
+    \begin{lrbox}{\@tufte@caption@box}%
+      \begin{minipage}[\floatalignment]{\marginparwidth}\hbox{}%
+        \ifthenelse{\NOT\equal{\@tufte@stored@caption}{}}{\@tufte@orig@caption[\@tufte@stored@shortcaption]{\@tufte@stored@caption}}{}%
+        \ifthenelse{\NOT\equal{\@tufte@stored@label}{}}{\@tufte@orig@label{\@tufte@stored@label}}{}%
+        \par\vspace{-\prevdepth}%% TODO: DOUBLE-CHECK FOR SAFETY
+      \end{minipage}%
+    \end{lrbox}%
+    % now typeset the stored boxes
+    \begin{fullwidth}%
+      \begin{minipage}[\floatalignment]{\linewidth}%
+        \ifthenelse{\boolean{@tufte@float@star}}%
+          {\@tufte@float@fullwidth[\@tufte@caption@vertical@offset]{\@tufte@figure@box}{\@tufte@caption@box}}%
+          {\@tufte@float@textwidth[\@tufte@caption@vertical@offset]{\@tufte@figure@box}{\@tufte@caption@box}}%
+      \end{minipage}%
+    \end{fullwidth}%
+    \@tufte@orig@endfloat% end original LaTeX float environment
+    % output debug info
+    \ifthenelse{\boolean{@tufte@debug}}{%
+      \typeout{^^J^^J----------- Tufte-LaTeX float information ----------}%
+      \ifthenelse{\equal{\@tufte@stored@label}{}}%
+        {\typeout{Warning: Float unlabeled!}}%
+        {\typeout{Float label: [\@tufte@stored@label]}}%
+      \typeout{Page number: [\thepage]}%
+      \def\MessageBreak{^^J}%
+      \typeout{\@tufte@float@debug@info}%
+      \ifthenelse{\boolean{@tufte@symmetric}}%
+        {\typeout{Symmetric: [true]}}%
+        {\typeout{Symmetric: [false]}}%
+      \typeout{----------------------------------------------------^^J^^J}%
+    }{}%
+    % reset commands and temp boxes and captions
+    \gdef\@tufte@float@debug@info{}%
+    \let\caption\@tufte@orig@caption%
+    \let\label\@tufte@orig@label%
+    \begin{lrbox}{\@tufte@figure@box}\hbox{}\end{lrbox}%
+    \begin{lrbox}{\@tufte@caption@box}\hbox{}\end{lrbox}%
+    \gdef\@tufte@stored@shortcaption{}%
+    \gdef\@tufte@stored@caption{}%
+    \gdef\@tufte@stored@label{}%
+    \gsetlength{\@tufte@caption@vertical@offset}{0pt}% reset caption offset
+  }
+
+\newcommand{\@tufte@float@textwidth}[3][0pt]{%
+  \ifthenelse{\NOT\boolean{@tufte@symmetric}\OR\boolean{@tufte@float@recto}}{%
+    % asymmetric or page is odd, so caption is on the right
+    \hbox{%
+      \usebox{#2}%
+      \hspace{\marginparsep}%
+      \smash{\raisebox{#1}{\usebox{#3}}}%
+    }%
+    \@tufte@float@debug{Caption position: [right]}%
+  }{% symmetric pages and page is even, so caption is on the left
+    \hbox{%
+      \smash{\raisebox{#1}{\usebox{#3}}}%
+      \hspace{\marginparsep}%
+      \usebox{#2}%
+    }%
+    \@tufte@float@debug{Caption position: [left]}%
+  }%
+}
+
+\newcommand{\@tufte@float@fullwidth}[3][0pt]{%
+  \ifthenelse{\equal{\floatalignment}{b}}%
+    {% place caption above figure
+      \ifthenelse{\NOT\boolean{@tufte@symmetric}\OR\boolean{@tufte@float@recto}}%
+        {\hfill\smash{\raisebox{#1}{\usebox{#3}}}\par\usebox{#2}\@tufte@float@debug{Caption position: [above right]}}% caption on the right
+        {\smash{\raisebox{#1}{\usebox{#3}}}\hfill\par\usebox{#2}\@tufte@float@debug{Caption position: [above left]}}% caption on the left
+    }{% place caption below figure
+      \ifthenelse{\NOT\boolean{@tufte@symmetric}\OR\boolean{@tufte@float@recto}}%
+        {\usebox{#2}\par\hfill\smash{\raisebox{#1}{\usebox{#3}}}\@tufte@float@debug{Caption position: [below right]}}% caption on the right
+        {\usebox{#2}\par\smash{\raisebox{#1}{\usebox{#3}}}\hfill\@tufte@float@debug{Caption position: [below left]}}% caption on the left
+    }%
+}
+
+
+%%
+% Redefine the figure environment to place the captions in the margin space
+
+\renewenvironment{figure}[1][htbp]
+  {\begin{@tufte@float}[#1]{figure}{}}
+  {\end{@tufte@float}}
+
+
+%%
+% Redefine the table environment to place the captions in the margin space
+
+\renewenvironment{table}[1][htbp]
+  {\begin{@tufte@float}[#1]{table}{}}
+  {\end{@tufte@float}}
+
+
+%%
+% Full-width figure
+
+\renewenvironment{figure*}[1][htbp]%
+  {\begin{@tufte@float}[#1]{figure}{star}}
+  {\end{@tufte@float}}
+
+
+%%
+% Full-width table
+
+\renewenvironment{table*}[1][htbp]%
+  {\begin{@tufte@float}[#1]{table}{star}}
+  {\end{@tufte@float}}
+
+
+%%
+% Full-page-width area
+
+\newenvironment{fullwidth}
+  {\ifthenelse{\boolean{@tufte@symmetric}}%
+     {\ifthenelse{\boolean{@tufte@changepage}}{\begin{adjustwidth*}{}{-\@tufte@overhang}}{\begin{adjustwidth}[]{}{-\@tufte@overhang}}}%
+     {\begin{adjustwidth}{}{-\@tufte@overhang}}%
+  }%
+  {\ifthenelse{\boolean{@tufte@symmetric}}%
+    {\ifthenelse{\boolean{@tufte@changepage}}{\end{adjustwidth*}}{\end{adjustwidth}}}%
+    {\end{adjustwidth}}%
+  }
+
+%%
+% Format the captions in a style similar to the sidenotes
+
+\long\def\@caption#1[#2]#3{%
+  \par%
+  \addcontentsline{\csname ext@#1\endcsname}{#1}%
+    {\protect\numberline{\csname the#1\endcsname}{\ignorespaces #2}}%
+  \begingroup%
+    \@parboxrestore%
+    \if@minipage%
+      \@setminipage%
+    \fi%
+    \@tufte@caption@font\@tufte@caption@justification%
+    \noindent\csname fnum@#1\endcsname: \ignorespaces#3\par%
+    %\@makecaption{\csname fnum@#1\endcsname}{\ignorespaces #3}\par
+  \endgroup}
+
+%%
+% If we`re NOT using XeLaTeX and the `nofonts` class option was NOT provided,
+% we should load the Palatino, Helvetica, and Bera Mono fonts (if they are
+% installed.)
+
+\ifthenelse{\boolean{@tufte@loadfonts}\AND\NOT\boolean{@tufte@xetex}}{%
+  \IfFileExists{mathpazo.sty}{\RequirePackage[osf,sc]{mathpazo}}{}
+  \IfFileExists{helvet.sty}{\RequirePackage[scaled=0.90]{helvet}}{}
+  \IfFileExists{beramono.sty}{\RequirePackage[scaled=0.85]{beramono}}{}
+  \RequirePackage[T1]{fontenc}
+  \RequirePackage{textcomp}
+}{}
+
+
+%%
+% Turns newlines into spaces.  Based on code from the `titlesec` package.
+
+\DeclareRobustCommand{\@tufte@newlinetospace}{%
+  \@ifstar{\@tufte@newlinetospace@i}{\@tufte@newlinetospace@i}%
+}
+
+\def\@tufte@newlinetospace@i{%
+  \ifdim\lastskip>\z@\else\space\fi
+  \ignorespaces%
+}
+
+\DeclareRobustCommand{\newlinetospace}[1]{%
+  \let\@tufte@orig@cr\\% save the original meaning of \\
+  \def\\{\@tufte@newlinetospace}% turn \\ and \\* into \space
+  \let\newline\\% turn \newline into \space
+  #1%
+  \let\\\@tufte@orig@cr% revert to original meaning of \\
+}
+
+
+%%
+% Sets up the running heads and folios.
+
+\RequirePackage{fancyhdr}
+
+% Set the default page style to `fancy`
+\pagestyle{fancy}
+
+% Set the header/footer width to be the body text block plus the margin
+% note area.
+\AtBeginDocument{%
+  \ifthenelse{\boolean{@tufte@symmetric}}
+    {\fancyhfoffset[LE,RO]{\@tufte@overhang}}
+    {\fancyhfoffset[RE,RO]{\@tufte@overhang}}
+}
+
+% The running heads/feet don`t have rules
+\renewcommand{\headrulewidth}{0pt}
+\renewcommand{\footrulewidth}{0pt}
+
+% The `fancy` page style is the default style for all pages.
+\fancyhf{} % clear header and footer fields
+\ifthenelse{\boolean{@tufte@twoside}}
+  {\fancyhead[LE]{\thepage\quad\smallcaps{\newlinetospace{\plainauthor}}}%
+    \fancyhead[RO]{\smallcaps{\newlinetospace{\plaintitle}}\quad\thepage}}
+  {\fancyhead[RE,RO]{\smallcaps{\newlinetospace{\plaintitle}}\quad\thepage}}
+
+
+% The `plain` page style is used on chapter opening pages.
+% In Tufte`s /Beautiful Evidence/ he never puts page numbers at the
+% bottom of pages -- the folios are unexpressed.
+\fancypagestyle{plain}{
+  \fancyhf{} % clear header and footer fields
+  % Uncomment the following five lines of code if you want the opening page
+  % of the chapter to express the folio in the lower outside corner.
+  %\ifthenelse{\boolean{@tufte@twoside}}
+  %  {\fancyfoot[LE,RO]{\thepage}}
+  %  {\fancyfoot[RE,RO]{\thepage}}
+}
+
+% The `empty` page style suppresses all headers and footers.
+% It`s used on title pages and `intentionally blank` pages.
+\fancypagestyle{empty}{
+  \fancyhf{} % clear header and footer fields
+}
+
+
+%%
+% Set raggedright and paragraph indentation for document
+
+\AtBeginDocument{\@tufte@justification}
+
+
+%%
+% Prints the list of class options and their states.
+
+\newcommand{\typeoutbool}[2]{%
+  \ifthenelse{\boolean{#2}}
+    {\typeout{\space\space#1: true}}
+    {\typeout{\space\space#1: false}}
+}
+
+\newcommand{\typeoutstr}[2]{%
+  \typeout{\space\space#1: #2}
+}
+
+\newcommand{\PrintTufteSettings}{%
+  \typeout{-------------------- Tufte-LaTeX settings ----------}
+  \typeout{Class: \@tufte@pkgname}
+  \typeout{}
+  \typeout{Class options:}
+  \typeoutbool{a4paper}{@tufte@afourpaper}
+  \typeoutbool{b5paper}{@tufte@bfivepaper}
+  \typeoutbool{load fonts}{@tufte@loadfonts}
+  \typeoutbool{fully-justified}{@tufte@justified}
+  \typeoutbool{letterspacing}{@tufte@letterspace}
+  \typeoutbool{sans-serif sidenotes}{@tufte@sfsidenotes}
+  \typeoutbool{symmetric margins}{@tufte@symmetric}
+  \typeoutbool{titlepage}{@tufte@titlepage}
+  \typeoutbool{twoside}{@tufte@twoside}
+  \typeoutbool{debug}{@tufte@debug}
+  \typeout{}
+  \typeout{Internal variables:}
+  \typeoutbool{[twoside]}{@twoside}
+  \typeoutbool{pdflatex}{@tufte@pdf}
+  \typeoutbool{xelatex}{@tufte@xetex}
+  \typeout{----------------------------------------------------}
+}
+
+
+
+%%
+% Color
+\RequirePackage[usenames,dvipsnames,svgnames]{xcolor}
+
+%%
+% Produces a full title page
+
+\newcommand{\maketitlepage}[0]{%
+  \cleardoublepage%
+  {%
+  \sffamily%
+  \begin{fullwidth}%
+  \fontsize{18}{20}\selectfont\par\noindent\textcolor{darkgray}{\allcaps{\thanklessauthor}}%
+  \vspace{11.5pc}%
+  \fontsize{36}{40}\selectfont\par\noindent\textcolor{darkgray}{\allcaps{\thanklesstitle}}%
+  \vfill%
+  \fontsize{14}{16}\selectfont\par\noindent\allcaps{\thanklesspublisher}%
+  \end{fullwidth}%
+  }
+  \thispagestyle{empty}%
+  \clearpage%
+}
+
+%%
+% Title block
+
+% \makeatletter
+% \renewcommand{\maketitle}{%
+%   \newpage
+%   \global\@topnum\z@% prevent floats from being placed at the top of the page
+%   \begingroup
+%     \setlength{\parindent}{0pt}%
+%     \setlength{\parskip}{4pt}%
+%     \let\@@title\@empty
+%     \let\@@author\@empty
+%     \let\@@date\@empty
+%     \ifthenelse{\boolean{@tufte@sfsidenotes}}{%
+%       \gdef\@@title{\sffamily\LARGE\allcaps{\@title}\par}%
+%       \gdef\@@author{\sffamily\Large\allcaps{\@author}\par}%
+%       \gdef\@@date{\sffamily\Large\allcaps{\@date}\par}%
+%     }{%
+%       \gdef\@@title{\LARGE\itshape\centering\@title\par}%
+%       \gdef\@@author{\Large\itshape\centering\@author\par}%
+%       \gdef\@@date{\Large\itshape\centering\@date\par}%
+%     }%
+%     \@@title
+%     \@@author
+%     \@@date
+%   \endgroup
+%   \thispagestyle{plain}% suppress the running head
+%   \tuftebreak% add some space before the text begins
+%   \@afterindentfalse\@afterheading% suppress indentation of the next paragraph
+% }
+% \makeatother
+
+% \renewcommand{\maketitle}{%
+%   \newpage
+%   \global\@topnum\z@% prevent floats from being placed at the top of the page
+%   \begingroup
+%   \setlength{\parindent}{0pt}
+%   \setlength{\parskip}{4pt}
+%   \ifthenelse{\boolean{@tufte@sfsidenotes}}
+%     {\begingroup
+%       % FIXME fails with \thanks
+%       \sffamily
+%       \par{\LARGE\allcaps{\@title}}
+%       \ifthenelse{\equal{\@author}{}}{}{\par{\Large\allcaps{\@author}}}
+%       \ifthenelse{\equal{\@date}{}}{}{\par{\Large\allcaps{\@date}}}
+%     \endgroup}
+%     {\begingroup
+%       \par{\LARGE\textit{\@title}}
+%       \ifthenelse{\equal{\@author}{}}{}{\par{\Large\textit{\@author}}}
+%       \ifthenelse{\equal{\@date}{}}{}{\par{\Large\textit{\@date}}}
+%       % \par{\LARGE{\@title}}
+%       % \ifthenelse{\equal{\@author}{}}{}{\par{\Large{\@author}}}
+%       % \ifthenelse{\equal{\@date}{}}{}{\par{\Large{\@date}}}
+%     \endgroup}
+%   \par
+%   \endgroup
+%   \thispagestyle{plain}% suppress the running head
+% }
+
+
+%%
+% Title page (if the `titlepage` option was passed to the tufte-handout
+% class.)
+
+\ifthenelse{\boolean{@tufte@titlepage}}
+  {\renewcommand{\maketitle}{\maketitlepage}}
+  {}
+
+%%
+% When \cleardoublepage is called, produce a blank (empty) page -- i.e.,
+% without headers and footers
+\def\cleardoublepage{\clearpage\if@twoside\ifodd\c@page\else
+  \hbox{}
+  %\vspace*{\fill}
+  %\begin{center}
+  %  This page intentionally contains only this sentence.
+  %\end{center}
+  %\vspace{\fill}
+  \thispagestyle{empty}
+  \newpage
+  \if@twocolumn\hbox{}\newpage\fi\fi\fi}
+
+%%
+% Make Tuftian-style section headings and TOC formatting
+
+\titleformat{\chapter}%
+  [display]% shape
+  {\relax\ifthenelse{\NOT\boolean{@tufte@symmetric}}{\begin{fullwidth}}{}}% format applied to label+text
+  {\itshape\huge\thechapter}% label
+  {0pt}% horizontal separation between label and title body
+  {\huge\rmfamily\itshape}% before the title body
+  [\ifthenelse{\NOT\boolean{@tufte@symmetric}}{\end{fullwidth}}{}]% after the title body
+
+\titleformat{\section}%
+  [hang]% shape
+  {\normalfont\Large\itshape}% format applied to label+text
+  {\thesection}% label
+  {1em}% horizontal separation between label and title body
+  {}% before the title body
+  []% after the title body
+
+\titleformat{\subsection}%
+  [hang]% shape
+  {\normalfont\large\itshape}% format applied to label+text
+  {\thesubsection}% label
+  {1em}% horizontal separation between label and title body
+  {}% before the title body
+  []% after the title body
+
+\titleformat{\paragraph}%
+  [runin]% shape
+  {\normalfont\itshape}% format applied to label+text
+  {\theparagraph}% label
+  {1em}% horizontal separation between label and title body
+  {}% before the title body
+  []% after the title body
+
+\titlespacing*{\chapter}{0pt}{50pt}{40pt}
+\titlespacing*{\section}{0pt}{3.5ex plus 1ex minus .2ex}{2.3ex plus .2ex}
+\titlespacing*{\subsection}{0pt}{3.25ex plus 1ex minus .2ex}{1.5ex plus.2ex}
+  
+% Subsubsection and following section headings should not be used.
+% See Bringhursts _The Elements of Typography_, section 4.2.2.
+\renewcommand\subsubsection{%
+  \TufteError{\noexpand\subsubsection is undefined by this class.%
+    \MessageBreak See Robert Bringhursts _The Elements of 
+    \MessageBreak Typographic Style_, section 4.2.2.
+    \MessageBreak \noexpand\subsubsection was used}
+    {From Bringhursts _The Elements of Typographic Style_, section 4.2.2: Use as 
+    \MessageBreak many levels of headings as you need, no more and no fewer.  Also see the many 
+    \MessageBreak related threads on Ask E.T. at http://www.edwardtufte.com/.}
+}
+
+\renewcommand\subparagraph{%
+  \TufteError{\noexpand\subparagraph is undefined by this class.%
+    \MessageBreak See Robert Bringhursts _The Elements of 
+    \MessageBreak Typographic Style_, section 4.2.2.
+    \MessageBreak \noexpand\subparagraph was used}
+    {From Bringhursts _The Elements of Typographic Style_, section 4.2.2: Use as 
+    \MessageBreak many levels of headings as you need, no more and no fewer.  Also see the many 
+    \MessageBreak related threads on Ask E.T. at http://www.edwardtufte.com/.}
+}
+
+
+% Formatting for main TOC (printed in front matter)
+% {section} [left] {above} {before w/label} {before w/o label} {filler + page} [after]
+\ifthenelse{\boolean{@tufte@toc}}{%
+  \titlecontents{part}% FIXME
+    [0em] % distance from left margin
+    {\vspace{1.5\baselineskip}\begin{fullwidth}\LARGE\rmfamily\itshape} % above (global formatting of entry)
+    {\contentslabel{2em}} % before w/label (label = ``II``)
+    {} % before w/o label
+    {\rmfamily\upshape\qquad\thecontentspage} % filler + page (leaders and page num)
+    [\end{fullwidth}] % after
+  \titlecontents{chapter}%
+    [0em] % distance from left margin
+    {\vspace{1.5\baselineskip}\begin{fullwidth}\LARGE\rmfamily\itshape} % above (global formatting of entry)
+    {\hspace*{0em}\contentslabel{2em}} % before w/label (label = ``2``)
+    {\hspace*{0em}} % before w/o label
+    {\rmfamily\upshape\qquad\thecontentspage} % filler + page (leaders and page num)
+    [\end{fullwidth}] % after
+  \titlecontents{section}% FIXME
+    [0em] % distance from left margin
+    {\vspace{0\baselineskip}\begin{fullwidth}\Large\rmfamily\itshape} % above (global formatting of entry)
+    {\hspace*{2em}\contentslabel{2em}} % before w/label (label = ``2.6``)
+    {\hspace*{2em}} % before w/o label
+    {\rmfamily\upshape\qquad\thecontentspage} % filler + page (leaders and page num)
+    [\end{fullwidth}] % after
+  \titlecontents{subsection}% FIXME
+    [0em] % distance from left margin
+    {\vspace{0\baselineskip}\begin{fullwidth}\large\rmfamily\itshape} % above (global formatting of entry)
+    {\hspace*{4em}\contentslabel{4em}} % before w/label (label = ``2.6.1``)
+    {\hspace*{4em}} % before w/o label
+    {\rmfamily\upshape\qquad\thecontentspage} % filler + page (leaders and page num)
+    [\end{fullwidth}] % after
+  \titlecontents{paragraph}% FIXME
+    [0em] % distance from left margin
+    {\vspace{0\baselineskip}\begin{fullwidth}\normalsize\rmfamily\itshape} % above (global formatting of entry)
+    {\hspace*{6em}\contentslabel{2em}} % before w/label (label = ``2.6.0.0.1``)
+    {\hspace*{6em}} % before w/o label
+    {\rmfamily\upshape\qquad\thecontentspage} % filler + page (leaders and page num)
+    [\end{fullwidth}] % after
+}{}
+
+%%
+% Format lists of figures/tables
+
+\renewcommand\listoffigures{%
+  \ifthenelse{\equal{\@tufte@class}{book}}%
+    {\chapter*{\listfigurename}}%
+    {\section*{\listfigurename}}%
+%  \begin{fullwidth}%
+    \@starttoc{lof}%
+%  \end{fullwidth}%
+}
+
+\renewcommand\listoftables{%
+  \ifthenelse{\equal{\@tufte@class}{book}}%
+    {\chapter*{\listtablename}}%
+    {\section*{\listtablename}}%
+%  \begin{fullwidth}%
+    \@starttoc{lot}%
+%  \end{fullwidth}%
+}
+
+\newcommand{\@tufte@lof@line}[2]{%
+  % #1 is the figure/table number and its caption text
+  % #2 is the page number on which the figure/table appears
+  \leftskip 0.0em
+  \rightskip 0em
+  \parfillskip 0em plus 1fil
+  \parindent 0.0em
+  \@afterindenttrue
+  \interlinepenalty\@M
+  \leavevmode
+  \@tempdima 2.0em
+  \advance\leftskip\@tempdima
+  \null\nobreak\hskip -\leftskip
+  {#1}\nobreak\qquad\nobreak#2%
+  \par%
+}
+
+\renewcommand*\l@figure{\@tufte@lof@line}
+\let\l@table\l@figure
+
+
+%%
+% A handy command to disable hyphenation for short bits of text.
+% Borrowed from Peter Wilson`s `hyphenat` package.
+
+\newlanguage\langwohyphens% define a language without hyphenation rules
+\newcommand{\nohyphens}[1]{{\language\langwohyphens #1}}% used for short bits of text
+\newcommand{\nohyphenation}{\language\langwohyphens}% can be used inside environments for longer text
+
+%%
+% The bibliography environment
+
+\setlength\bibindent{1.5em}
+\renewenvironment{thebibliography}[1]
+  {%
+    \ifthenelse{\equal{\@tufte@class}{book}}%
+      {\chapter{\bibname}}%
+      {\section*{\refname}}%
+%   \@mkboth{\MakeUppercase\bibname}{\MakeUppercase\bibname}%
+    \list{\@biblabel{\@arabic\c@enumiv}}%
+         {\settowidth\labelwidth{\@biblabel{#1}}%
+          \leftmargin\labelwidth
+          \advance\leftmargin\labelsep
+          \@openbib@code
+          \usecounter{enumiv}%
+          \let\p@enumiv\@empty
+          \renewcommand\theenumiv{\@arabic\c@enumiv}}%
+    \sloppy
+    \clubpenalty4000
+    \@clubpenalty \clubpenalty
+    \widowpenalty4000%
+    \sfcode`\.\@m%
+  }
+  {%
+    \def\@noitemerr
+    {\@latex@warning{Empty `thebibliography` environment}}%
+    \endlist%
+  }
+\renewcommand\newblock{\hskip .11em\@plus.33em\@minus.07em}
+
+
+%%
+% An index environment to mimic Tuftes indexes
+
+\RequirePackage{multicol}
+\renewenvironment{theindex}
+  {\begin{fullwidth}%
+    \small%
+    \ifthenelse{\equal{\@tufte@class}{book}}%
+      {\chapter{\indexname}}%
+      {\section*{\indexname}}%
+    \parskip0pt%
+    \parindent0pt%
+    \let\item\@idxitem%
+    \begin{multicols}{3}%
+  }
+  {\end{multicols}%
+    \end{fullwidth}%
+  }
+\renewcommand\@idxitem{\par\hangindent 2em}
+\renewcommand\subitem{\par\hangindent 3em\hspace*{1em}}
+\renewcommand\subsubitem{\par\hangindent 4em\hspace*{2em}}
+\renewcommand\indexspace{\par\addvspace{1.0\baselineskip plus 0.5ex minus 0.2ex}\relax}%
+\newcommand{\lettergroup}[1]{}% swallow the letter heading in the index
+
+
+%%
+% A couple commands to incresae the number of floats you can use at a time.
+
+\def\morefloats{% provides a total of 52 floats
+  \ifthenelse{\isundefined{\bx@S}}{%
+    \TufteDebugInfoNL{Adding 34 more float slots.}
+    \newinsert\bx@S
+    \newinsert\bx@T
+    \newinsert\bx@U
+    \newinsert\bx@V
+    \newinsert\bx@W
+    \newinsert\bx@X
+    \newinsert\bx@Y
+    \newinsert\bx@Z
+    \newinsert\bx@a
+    \newinsert\bx@b
+    \newinsert\bx@c
+    \newinsert\bx@d
+    \newinsert\bx@e
+    \newinsert\bx@f
+    \newinsert\bx@g
+    \newinsert\bx@h
+    \newinsert\bx@i
+    \newinsert\bx@j
+    \newinsert\bx@k
+    \newinsert\bx@l
+    \newinsert\bx@m
+    \newinsert\bx@n
+    \newinsert\bx@o
+    \newinsert\bx@p
+    \newinsert\bx@q
+    \newinsert\bx@r
+    \newinsert\bx@s
+    \newinsert\bx@t
+    \newinsert\bx@u
+    \newinsert\bx@v
+    \newinsert\bx@w
+    \newinsert\bx@x
+    \newinsert\bx@y
+    \newinsert\bx@z
+    \gdef\@freelist{\@elt\bx@A\@elt\bx@B\@elt\bx@C\@elt\bx@D\@elt\bx@E
+                    \@elt\bx@F\@elt\bx@G\@elt\bx@H\@elt\bx@I\@elt\bx@J
+                    \@elt\bx@K\@elt\bx@L\@elt\bx@M\@elt\bx@N
+                    \@elt\bx@O\@elt\bx@P\@elt\bx@Q\@elt\bx@R
+                    \@elt\bx@S\@elt\bx@T\@elt\bx@U\@elt\bx@V
+                    \@elt\bx@W\@elt\bx@X\@elt\bx@Y\@elt\bx@Z
+                    \@elt\bx@a\@elt\bx@b\@elt\bx@c\@elt\bx@d\@elt\bx@e
+                    \@elt\bx@f\@elt\bx@g\@elt\bx@h\@elt\bx@i\@elt\bx@j
+                    \@elt\bx@k\@elt\bx@l\@elt\bx@m\@elt\bx@n
+                    \@elt\bx@o\@elt\bx@p\@elt\bx@q\@elt\bx@r
+                    \@elt\bx@s\@elt\bx@t\@elt\bx@u\@elt\bx@v
+                    \@elt\bx@w\@elt\bx@x\@elt\bx@y\@elt\bx@z}%
+  }{% we have already added another 34 floats, so we`ll add 26 more, but that`s it!
+    \ifthenelse{\isundefined{\bx@AA}}{%
+      \TufteDebugInfoNL{Adding 26 more float slots.}
+      \newinsert\bx@AA
+      \newinsert\bx@BB
+      \newinsert\bx@CC
+      \newinsert\bx@DD
+      \newinsert\bx@EE
+      \newinsert\bx@FF
+      \newinsert\bx@GG
+      \newinsert\bx@HH
+      \newinsert\bx@II
+      \newinsert\bx@JJ
+      \newinsert\bx@KK
+      \newinsert\bx@LL
+      \newinsert\bx@MM
+      \newinsert\bx@NN
+      \newinsert\bx@OO
+      \newinsert\bx@PP
+      \newinsert\bx@QQ
+      \newinsert\bx@RR
+      \newinsert\bx@SS
+      \newinsert\bx@TT
+      \newinsert\bx@UU
+      \newinsert\bx@VV
+      \newinsert\bx@WW
+      \newinsert\bx@XX
+      \newinsert\bx@YY
+      \newinsert\bx@ZZ
+      \gdef\@freelist{\@elt\bx@A\@elt\bx@B\@elt\bx@C\@elt\bx@D\@elt\bx@E
+                      \@elt\bx@F\@elt\bx@G\@elt\bx@H\@elt\bx@I\@elt\bx@J
+                      \@elt\bx@K\@elt\bx@L\@elt\bx@M\@elt\bx@N
+                      \@elt\bx@O\@elt\bx@P\@elt\bx@Q\@elt\bx@R
+                      \@elt\bx@S\@elt\bx@T\@elt\bx@U\@elt\bx@V
+                      \@elt\bx@W\@elt\bx@X\@elt\bx@Y\@elt\bx@Z
+                      \@elt\bx@a\@elt\bx@b\@elt\bx@c\@elt\bx@d\@elt\bx@e
+                      \@elt\bx@f\@elt\bx@g\@elt\bx@h\@elt\bx@i\@elt\bx@j
+                      \@elt\bx@k\@elt\bx@l\@elt\bx@m\@elt\bx@n
+                      \@elt\bx@o\@elt\bx@p\@elt\bx@q\@elt\bx@r
+                      \@elt\bx@s\@elt\bx@t\@elt\bx@u\@elt\bx@v
+                      \@elt\bx@w\@elt\bx@x\@elt\bx@y\@elt\bx@z
+                      \@elt\bx@AA\@elt\bx@BB\@elt\bx@CC\@elt\bx@DD\@elt\bx@EE
+                      \@elt\bx@FF\@elt\bx@GG\@elt\bx@HH\@elt\bx@II\@elt\bx@JJ
+                      \@elt\bx@KK\@elt\bx@LL\@elt\bx@MM\@elt\bx@NN
+                      \@elt\bx@OO\@elt\bx@PP\@elt\bx@QQ\@elt\bx@RR
+                      \@elt\bx@SS\@elt\bx@TT\@elt\bx@UU\@elt\bx@VV
+                      \@elt\bx@WW\@elt\bx@XX\@elt\bx@YY\@elt\bx@ZZ}%
+    }{%
+      \TufteError{You may only call \string\morefloats\space twice. See the\MessageBreak Tufte-LaTeX documentation for other workarounds}
+        {There are already 78 float slots allocated. Try using \string\FloatBarrier\space or\MessageBreak \string\clearpage\space to place some floats before creating more.}
+    }%
+  }%
+}
+
+
+%%
+% Detect if the subfigure package has been loaded
+
+\newboolean{@tufte@packages@subfigure}
+\setboolean{@tufte@packages@subfigure}{false}
+\AtBeginDocument{%
+  \@ifpackageloaded{subfigure}
+    {\gsetboolean{@tufte@packages@subfigure}{true}}
+    {\gsetboolean{@tufte@packages@subfigure}{false}}%
+}
+
+
+%%
+% If debugging is enabled, print the Tufte-LaTeX options and the list of
+% files.
+
+\ifthenelse{\boolean{@tufte@debug}}
+  {\PrintTufteSettings\listfiles}
+  {}
+
+
+%%
+% If there is a `tufte-common-local.tex` file, load it up.
+
+\IfFileExists{tufte-common-local.tex}
+  {\input{tufte-common-local.tex}%
+   \TufteInfoNL{Loading tufte-common-local.tex}}
+  {}
+
+
+%%
+% End of file
+\endinput
diff --git a/2021/solution/hw14-subgroup-solution/tufte-handout.cls b/2021/solution/hw14-subgroup-solution/tufte-handout.cls
new file mode 100644
index 0000000..767f518
--- /dev/null
+++ b/2021/solution/hw14-subgroup-solution/tufte-handout.cls
@@ -0,0 +1,39 @@
+\NeedsTeXFormat{LaTeX2e}[1994/06/01]
+
+\ProvidesClass{tufte-handout}[2009/12/11 v3.5.0 Tufte-handout class]
+
+%%
+% Declare we're tufte-handout
+\newcommand{\@tufte@class}{article}% the base LaTeX class (defaults to the article/handout style)
+\newcommand{\@tufte@pkgname}{tufte-handout}% the name of the package (defaults to tufte-handout)
+
+%%
+% Load the common style elements
+\input{tufte-common.def}
+
+
+%%
+% Set up any handout-specific stuff now
+
+%%
+% Abstract
+
+% TODO The abstract should be printed on its own page of the `titlepage'
+% option was specified.
+\renewenvironment{abstract}
+  {\begin{quotation}\if@tufte@sfsidenotes\begin{sffamily}\fi}
+  {\if@tufte@sfsidenotes\end{sffamily}\fi\end{quotation}}
+
+
+%%
+% If there is a `tufte-handout-local.tex' file, load it.
+
+\IfFileExists{tufte-handout-local.tex}
+  {\input{tufte-handout-local}
+   \TufteInfoNL{Loading tufte-handout-local.tex}}
+  {}
+
+
+%%
+% End of file
+\endinput
diff --git a/2021/solution/hw14-subgroup-solution/tufte-preamble.tex b/2021/solution/hw14-subgroup-solution/tufte-preamble.tex
new file mode 100644
index 0000000..8540aed
--- /dev/null
+++ b/2021/solution/hw14-subgroup-solution/tufte-preamble.tex
@@ -0,0 +1,28 @@
+% \geometry{showframe}% for debugging purposes -- displays the margins
+
+% Set up the images/graphics package
+\usepackage{graphicx}
+\setkeys{Gin}{width=\linewidth,totalheight=\textheight,keepaspectratio}
+% \graphicspath{{figs/}}
+
+% The following package makes prettier tables.  We're all about the bling!
+\usepackage{booktabs}
+
+% The units package provides nice, non-stacked fractions and better spacing for units.
+\usepackage{units}
+
+% Small sections of multiple columns
+\usepackage{multicol}
+
+% Provides paragraphs of dummy text
+\usepackage{lipsum}
+
+% These commands are used to pretty-print LaTeX commands
+\newcommand{\doccmd}[1]{\texttt{\textbackslash#1}}% command name -- adds backslash automatically
+\newcommand{\docopt}[1]{\ensuremath{\langle}\textrm{\textit{#1}}\ensuremath{\rangle}}% optional command argument
+\newcommand{\docarg}[1]{\textrm{\textit{#1}}}% (required) command argument
+\newenvironment{docspec}{\begin{quote}\noindent}{\end{quote}}% command specification environment
+\newcommand{\docenv}[1]{\textsf{#1}}% environment name
+\newcommand{\docpkg}[1]{\texttt{#1}}% package name
+\newcommand{\doccls}[1]{\texttt{#1}}% document class name
+\newcommand{\docclsopt}[1]{\texttt{#1}}% document class option name