4 sentences

Write no more than 1 sentence per item (1 sentence on a confusing thing, another sentence on a odd thing, 1 sentence on a useful thing, 1 sentence on an interesting thing).

only from chapter 9 until chapter 14 

from this book bellow 

https://www.nesacenter.org/uploaded/conferences/SEC/2014/handouts/Rick_Detwiler/15_Detwiler_Resources.pdf