History of project 6 changes

In crates/oh/src/main.rs, lines 1728–1894 on 80642fde09cc3932f252db2388d4e84b5ea6e36f59f345ce13117e8db11e036b. 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 1728,1894:crates/oh/src/main.rs.