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Re:Making Emacs Popular Again (2020) by teddyh on Thursday November 04, 2021 @10:06AM (#29107337)
> for Undo to be on control _ as on control z.

Well, Ctrl-_ is three keys; control, shift and _. However, Undo in Emacs is actually designed to be on the two-key combination Ctrl-/ and the fact that this key produces the same ASCII control code as Ctrl-_ is incidental.

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