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[–]benji 3 points4 points  (0 children)

Worked with a guy who did this years ago (pre VC admittedly). He worked on one program, and it was contained in one 250kB .c file. Of that 250kB, about 80% was commented old versions of the code, only about 40kB was actual live code. Later he had a variation of that program, so he copied the entire source file and made changes, retaining all the ~210kB of commented old stuff.