`mv` is defined on the same line as `ma` is, right after the five `#define`s. `pr` is on the last line before the only line break. It's a pretty dense program

`mv` is defined on the same line as `ma` is, right after the five `#define`s. `pr` is on the last line before the only line break. It's a pretty dense program to walk through, but not as completely impenetrable as I first thought after taking some time and making notes as I went.