diff --git a/_posts/2017-10-20-Racket Essentials.md b/_posts/2017-10-20-Racket Essentials.md
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-layout: post
-title: Racket Essentials
-categories: [The Racket Guide]
-tags: Racket
----
-
-## Simple Values
-1. Numbers
-所有的数值类型，包括分数和虚数。
-
-2. Booleans
-`#t` 代表 true，`#f` 代表 false。另外，所有的非 `#f` 值都被视为 true。
-
-3. Strings
-双引号包围的任意文本就是字符串，可以使用任何 Unicode 字符。
-
-## Simple Definitions and Expressions
-```racket
-(define pie 3)   ; defines pie to be 3
-
-(define (piece str)
-  (substring str 0 pie))
-```
-
-## Lists, Iteration, and Recursion
-
-
-## Pairs, Lists, and Racket Syntax
diff --git a/_posts/2017-10-21-Racket Built-In Datatypes.md b/_posts/2017-10-21-Racket Built-In Datatypes.md
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-title: Racket Built-In Datatypes
-categories: [The Racket Guide]
-tags: Racket
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diff --git a/_posts/2017-10-22-Racket Expressions and Definitions.md b/_posts/2017-10-22-Racket Expressions and Definitions.md
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-title: Racket Expressions and Definitions
-categories: [The Racket Guide]
-tags: Racket
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diff --git a/_posts/2017-10-23-Racket Programmer-Defined Datatypes.md b/_posts/2017-10-23-Racket Programmer-Defined Datatypes.md
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-layout: post
-title: Racket Programmer-Defined Datatypes
-categories: [The Racket Guide]
-tags: Racket
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diff --git a/_posts/2017-10-24-Racket Modules.md b/_posts/2017-10-24-Racket Modules.md
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-layout: post
-title: Racket Modules
-categories: [The Racket Guide]
-tags: Racket
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diff --git a/_posts/2017-10-25-Racket Contracts.md b/_posts/2017-10-25-Racket Contracts.md
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-title: Racket Contracts
-categories: [The Racket Guide]
-tags: Racket
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diff --git a/_posts/2017-10-26-Racket Input and Output.md b/_posts/2017-10-26-Racket Input and Output.md
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-layout: post
-title: Racket Input and Output
-categories: [The Racket Guide]
-tags: Racket
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diff --git a/_posts/2017-10-27-Racket Regular Expressions.md b/_posts/2017-10-27-Racket Regular Expressions.md
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-layout: post
-title: Racket Regular Expressions
-categories: [The Racket Guide]
-tags: Racket
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diff --git a/_posts/2017-10-28-Racket Exceptions and Control.md b/_posts/2017-10-28-Racket Exceptions and Control.md
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-title: Racket Exceptions and Control
-categories: [The Racket Guide]
-tags: Racket
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