The Undo Command
The Undo command [u] undoes what you just did. It restores text that
you just deleted or
changed by mistake. It will only restore
the most recently changed text. If you deleted one line and then
another with separate commands, the undo command will only restore the
last line deleted.
The [U] command will restore the current line to the way it was before
you started changing it, even if you have made several changes.
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