Reverting ex17 to a state that should be pretty close to the book source ... still need to check
Reverting ex17 to a state that should be pretty close to the book source ... still need to check

meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand,meatballhat/box-o-sand