Updates 前言.md

18746521060 · 18746521060 · commit 8b5f8a17c4be · 2017-06-04T20:10:03.000+08:00
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diff --git a/SUMMARY.md b/SUMMARY.md
@@ -1,5 +1,6 @@
 # Summary
 
+* [前言](前言.md)
 * [第一天](README.md)
 * [第二天](chapter1.md)
 
diff --git a/前言.md b/前言.md
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+# 前言
