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add unit5
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#lang racket
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(define a 3)
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#reader(lib"read.ss""wxme")WXME0108 ##
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#|
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This file uses the GRacket editor format.
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Open this file in DrRacket version 7.1 or later to read it.
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Most likely, it was created by saving a program in DrRacket,
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and it probably contains a program with non-text elements
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(such as images or comment boxes).
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http://racket-lang.org/
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|#
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33 7 #"wxtext\0"
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3 1 6 #"wxtab\0"
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1 1 8 #"wximage\0"
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2 0 8 #"wxmedia\0"
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4 1 34 #"(lib \"syntax-browser.ss\" \"mrlib\")\0"
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1 0 36 #"(lib \"cache-image-snip.ss\" \"mrlib\")\0"
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1 0 68
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(
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#"((lib \"image-core.ss\" \"mrlib\") (lib \"image-core-wxme.rkt\" \"mr"
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#"lib\"))\0"
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) 1 0 16 #"drscheme:number\0"
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3 0 44 #"(lib \"number-snip.ss\" \"drscheme\" \"private\")\0"
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1 0 36 #"(lib \"comment-snip.ss\" \"framework\")\0"
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1 0 93
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(
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#"((lib \"collapsed-snipclass.ss\" \"framework\") (lib \"collapsed-sni"
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#"pclass-wxme.ss\" \"framework\"))\0"
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) 0 0 43 #"(lib \"collapsed-snipclass.ss\" \"framework\")\0"
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0 0 19 #"drscheme:sexp-snip\0"
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0 0 29 #"drscheme:bindings-snipclass%\0"
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1 0 101
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(
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#"((lib \"ellipsis-snip.rkt\" \"drracket\" \"private\") (lib \"ellipsi"
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#"s-snip-wxme.rkt\" \"drracket\" \"private\"))\0"
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) 2 0 88
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(
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#"((lib \"pict-snip.rkt\" \"drracket\" \"private\") (lib \"pict-snip.r"
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#"kt\" \"drracket\" \"private\"))\0"
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) 0 0 55
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#"((lib \"snip.rkt\" \"pict\") (lib \"snip-wxme.rkt\" \"pict\"))\0"
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1 0 34 #"(lib \"bullet-snip.rkt\" \"browser\")\0"
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0 0 25 #"(lib \"matrix.ss\" \"htdp\")\0"
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1 0 22 #"drscheme:lambda-snip%\0"
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1 0 29 #"drclickable-string-snipclass\0"
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0 0 26 #"drracket:spacer-snipclass\0"
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0 0 57
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#"(lib \"hrule-snip.rkt\" \"macro-debugger\" \"syntax-browser\")\0"
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1 0 26 #"drscheme:pict-value-snip%\0"
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0 0 45 #"(lib \"image-snipr.ss\" \"slideshow\" \"private\")\0"
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1 0 38 #"(lib \"pict-snipclass.ss\" \"slideshow\")\0"
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2 0 55 #"(lib \"vertical-separator-snip.ss\" \"stepper\" \"private\")\0"
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1 0 18 #"drscheme:xml-snip\0"
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1 0 31 #"(lib \"xml-snipclass.ss\" \"xml\")\0"
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1 0 21 #"drscheme:scheme-snip\0"
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2 0 34 #"(lib \"scheme-snipclass.ss\" \"xml\")\0"
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1 0 10 #"text-box%\0"
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1 0 32 #"(lib \"text-snipclass.ss\" \"xml\")\0"
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1 0 1 6 #"wxloc\0"
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0 0 55 0 1 #"\0"
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0 75 1 #"\0"
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0 10 90 -1 90 -1 3 -1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 255 255 255 1 -1 0 9
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#"Standard\0"
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0 75 12 #"Courier New\0"
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0 10 90 -1 90 -1 3 -1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 255 255 255 1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 -1 -1 2 24
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#"framework:default-color\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 150 0 150 0 0 0 -1 -1 2 15
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#"text:ports out\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 150 0 150 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1.0 0 -1 -1 93 -1 -1 -1 0 0 0 0 0 0 0 0 0 1.0 1.0 1.0 255 0 0 0 0 0 -1
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-1 2 15 #"text:ports err\0"
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0 -1 1 #"\0"
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1 0 -1 -1 93 -1 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 255 0 0 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 0 0 175 0 0 0 -1 -1 2 17
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#"text:ports value\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 0 175 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1.0 0 92 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1.0 1.0 1.0 34 139 34 0 0 0 -1
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-1 2 27 #"Matching Parenthesis Style\0"
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0 -1 1 #"\0"
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1.0 0 92 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1.0 1.0 1.0 34 139 34 0 0 0 -1
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-1 2 1 #"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 38 38 128 0 0 0 -1 -1 2 37
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#"framework:syntax-color:scheme:symbol\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 38 38 128 0 0 0 -1 -1 2 38
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#"framework:syntax-color:scheme:keyword\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 38 38 128 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 194 116 31 0 0 0 -1 -1 2
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38 #"framework:syntax-color:scheme:comment\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 194 116 31 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 41 128 38 0 0 0 -1 -1 2 37
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#"framework:syntax-color:scheme:string\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 41 128 38 0 0 0 -1 -1 2 35
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#"framework:syntax-color:scheme:text\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 41 128 38 0 0 0 -1 -1 2 39
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#"framework:syntax-color:scheme:constant\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 41 128 38 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 132 60 36 0 0 0 -1 -1 2 49
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#"framework:syntax-color:scheme:hash-colon-keyword\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 132 60 36 0 0 0 -1 -1 2 42
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#"framework:syntax-color:scheme:parenthesis\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 132 60 36 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 255 0 0 0 0 0 -1 -1 2 36
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#"framework:syntax-color:scheme:error\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 255 0 0 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 36
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#"framework:syntax-color:scheme:other\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 16
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#"Misspelled Text\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 81 112 203 0 0 0 -1 -1 2
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38 #"drracket:check-syntax:lexically-bound\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 81 112 203 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 178 34 34 0 0 0 -1 -1 2 28
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#"drracket:check-syntax:set!d\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 178 34 34 0 0 0 -1 -1 2 37
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#"drracket:check-syntax:unused-require\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 255 0 0 0 0 0 -1 -1 2 36
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#"drracket:check-syntax:free-variable\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 255 0 0 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 68 0 203 0 0 0 -1 -1 2 31
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#"drracket:check-syntax:imported\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 68 0 203 0 0 0 -1 -1 2 47
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#"drracket:check-syntax:my-obligation-style-pref\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 178 34 34 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 116 0 0 0 0 -1 -1 2 50
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#"drracket:check-syntax:their-obligation-style-pref\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 116 0 0 0 0 -1 -1 2 48
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#"drracket:check-syntax:unk-obligation-style-pref\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 139 142 28 0 0 0 -1 -1 2
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49 #"drracket:check-syntax:both-obligation-style-pref\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 139 142 28 0 0 0 -1 -1 2
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26 #"plt:htdp:test-coverage-on\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 1
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#"\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 1 0 0 0 0 0 0 255 165 0 0 0 0 -1 -1 2 27
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#"plt:htdp:test-coverage-off\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 1 0 0 0 0 0 0 255 165 0 0 0 0 -1 -1 4 1
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#"\0"
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0 70 1 #"\0"
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1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0
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-1 -1 4 4 #"XML\0"
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0 70 1 #"\0"
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1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0
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-1 -1 2 37 #"plt:module-language:test-coverage-on\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 38
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#"plt:module-language:test-coverage-off\0"
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0 -1 1 #"\0"
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1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 1 0 0 0 0 0 0 255 165 0 0 0 0 -1 -1 4 1
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#"\0"
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0 71 1 #"\0"
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1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0
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-1 -1 4 1 #"\0"
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0 -1 1 #"\0"
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1.0 0 -1 -1 -1 -1 -1 -1 1 0 0 0 0 0 0 0 0 1.0 1.0 1.0 0 0 255 0 0 0 -1
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-1 4 1 #"\0"
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0 71 1 #"\0"
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1.0 0 -1 -1 -1 -1 -1 -1 1 0 0 0 0 0 0 0 0 1.0 1.0 1.0 0 0 255 0 0 0 -1
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-1 4 1 #"\0"
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0 71 1 #"\0"
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1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1.0 1.0 1.0 0 100 0 0 0 0 -1
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-1 0 42 0 28 3 12 #"#lang racket"
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0 0 24 29 1 #"\n"
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0 0 24 3 1 #"("
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0 0 14 3 7 #"provide"
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0 0 24 3 2 #" ("
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0 0 14 3 14 #"all-define-out"
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0 0 24 3 2 #"))"
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0 0 24 29 1 #"\n"
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0 0 24 3 1 #"("
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0 0 15 3 6 #"define"
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0 0 24 3 1 #" "
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0 0 14 3 1 #"a"
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0 0 24 3 1 #" "
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0 0 21 3 1 #"3"
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0 0 24 3 1 #")"
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0 0 24 29 1 #"\n"
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0 0 24 3 1 #"("
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0 0 15 3 6 #"define"
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0 0 24 3 1 #" "
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0 0 14 3 1 #"b"
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0 0 24 3 2 #" ("
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0 0 14 3 1 #"+"
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0 0 24 3 1 #" "
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0 0 14 3 1 #"a"
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0 0 24 3 1 #" "
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0 0 21 3 1 #"2"
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0 0 24 3 2 #"))"
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0 0 24 29 1 #"\n"
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0 0 24 3 1 #"("
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0 0 15 3 6 #"define"
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0 0 24 3 1 #" "
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0 0 14 3 1 #"x"
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0 0 24 3 1 #" "
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0 0 21 3 1 #"3"
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0 0 24 3 1 #")"
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0 0 17 3 9 #";val x =3"
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0 0 24 29 1 #"\n"
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0 0 24 3 1 #"("
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0 0 15 3 6 #"define"
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0 0 24 3 1 #" "
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0 0 14 3 1 #"y"
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0 0 24 3 2 #" ("
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0 0
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