It would if the variable names were all a,b,c. But they're not, they are almost Polish Notation. There's a all right, but fn, cl, tag for callbacks classes and tags. Also n and m for integers in a range and x for iterable integers.

This is the work of someone with a ton of experience. You take 10 minutes to look at the code and understand it, then you are groking complex ideas and operations quickly. I'd love to work with whoever wrote that code.