History of extract 1 change

In src/cpu/extract.py, lines 16–20 on 03a3459e6372147b5d16d8410463208c38a7530ff5522230ddd2dddbb8f0829a. 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.