History of extract 1 change

In src/cpu/extract.py, lines 16–20 on 0adc2e74f5cf3318bed4a9a1bbf89afd9c9a7e46539f08e9ec66574243cc770d. 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 16,20:src/cpu/extract.py.