ruby |

Introduction
1. 一句话
2. readings
- 2.1. 黑客与画家
3. machine learning
- 3.1. review1
4. 编程语言
5. 工具
- 5.1. git
- 5.2. svn
6. 系统
- 6.1. website
- 6.2. linux
- 6.3. android
  - 6.3.1. core
  - 6.3.2. topic
    - 6.3.2.1. google-training
  - 6.3.3. bug
    - 6.3.3.1. fragment管理
    - 6.3.3.2. html5离线页面
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Don't Repeat Yourself

Convention over Configuration

DRY
CoC
There are many ways to do it