It's all about cryptography,you should read it because theres a better explanation,and it's also tackle about it's origin.

Compilation of codes and ciphers

101 funny jokes and sayings! A new joke or saying will be added every day until there is 101 jokes and sayings. I don't own any of these, and none of them are meant to offend anyone. If you have a joke or saying that you want featured in the book, comment it and I will dedicate you. Hope you enjoy!!