chapter 3 page 27
chapter 3 page 28
chapter 4 cover and page 1
chapter 4 page 2
chapter 4 page 3
chapter 4 page 4
chapter 4 page 5
chapter 4 page 6
chapter 4 page 7
chapter 4 page 8
chapter 4 page 9
chapter 4 page 10
chapter 4 page 11
chapter 4 page 12
chapter 4 page 13
chapter 4 page 14
chapter 4 page 15
chapter 4 page 16
Playing with git and racket.
Make log output prettier...fix some problems.