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In this chapter we describe commands that are useful when you catch
a mistake while editing. The most fundamental of these commands is
the undo command C-/ (also bound to C-x u and C-_).
This undoes a single command, or a
part of a command (as in the case of query-replace), or several
consecutive character insertions. Consecutive repetitions of
C-/ undo earlier and earlier changes, back to the limit of the
undo information available.
Aside from the commands described here, you can erase text using
deletion commands such as DEL (delete-backward-char).
These were described earlier in this manual. See Erasing Text.