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Re:Start Using Emacs – A Thorough Guide for Beginners by dgempesaw on Tuesday September 03, 2013 @03:38PM (#6323240)
C-/ is also undo, which is arguably easier to reach :)
Re:Start Using Emacs – A Thorough Guide for Beginners by lelf on Tuesday September 03, 2013 @05:23PM (#6323898)
Or C-x u