Inline and add tests for chapter 02-01
Inline chapter 02-02
Inline chapter 02-03
Inline chapter 03-01
Inline chapter 03-02
Inline chapter 03-03
Inline chapter 03-04
Inline chapter 04-01
Inline chapter 04-02
Inline chapter 04-03
Inline chapter 04-04
Inline chapter 04-05
Inline chapter 04-06