This is fascinating. When I was a kid I came across these very code books for Master Lock combination locks. The kind that every kid has on their locker. The b

This is fascinating. When I was a kid I came across these very code books for Master Lock combination locks. The kind that every kid has on their locker. The book came from a friend of a friend of a friend and was really a stack of photocopied pages from a book. Photocopied so many times that many of the combinations were blurry beyond legibility. When it did work though it was incredible.