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  • To make sure I understand this: if you were to swap file1 and file2, would all XaY become YdX, XcY become YcX, and XdY become YaX? Commented Oct 28, 2020 at 4:23
  • @BallpointBen more likely the differences listed will change in order. It's much easier to understand if you just create a couple of files to play with. Commented Oct 28, 2020 at 12:20
  • The last panel is a very good summary. I however noticed that diff tends to "c" things instead of using "a" : if you add 10 lines on file 1 before line N, and modify also the line N slightly: instead of having 2 changes ( N-11,N-1aN NcN) there is only 1 ( N-11,NcN) Commented Jan 17 at 9:43