feverishly hitting ESC . and --oops-- just passed what I wanted

[Dan Jacobson]

Let's say I'm feverishly hitting ESC . and --oops-- just passed what I
wanted... is there any way to go back one hit instead of starting all
over again?

Also it would be neat if say I could do C-h k to find out the names of
keys instead of looking thru the bind command.
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