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 Syntax: +UNDO

 This command undoes the effects of your last message write, +edit, +include, 
 or +undo command. (That means executing +UNDO twice in a row leaves your 
 message unaffected.) It's particularly good for when you use +EDIT and 
 accidentally fubar your entire message. Hit +UNDO and it will return to 
 it's previous state. This command does not affect your addressee list or 
 subject line.
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