History of project 3 changes

In crates/oh/src/main.rs, lines 1657–1771 on a549ddd5941ffe53cfa2efc116cf480e103dcf71b7ff693631ee529601089d74. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 1657,1771:crates/oh/src/main.rs.