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[[http://en.wikipedia.org/wiki/Help:Reverting Undo versus Rollback]] : Rollback works much quicker than undo and may only be used in certain circumstances; most commonly to revert obvious vandalism. [[http://en.wikipedia.org/wiki/Help:Reverting Undo versus Rollback]] : Rollback works much quicker than undo and may only be used in certain circumstances; most commonly to revert obvious vandalism.