X/Z are used in the 'program structure' example without introducing them beforehand Probably intentional. A big part of the skill of reverse-engineering that t

X/Z are used in the 'program structure' example without introducing them beforehand Probably intentional. A big part of the skill of reverse-engineering that they're introducing here is the feeling of "I don't understand what this line does, so I'll just accept it and move on, and see if I understand it later". Using X/Z before describing it is definitely in keeping with that feeling. The whole document reads as "we're intentionally throwing you in the deep end by giving you not quite enough to understand completely, but giving you enough that you can understand with some work". It's a similar approach to Microcorruption, and to the crypto challenges. I like it.