undo red button correct fix go back revise mistake error

back backward button change changed changing contradict contradiction contradictory correct corrected correcting correction edit editing editor error fix fixed fixing goof improve improved improvement improving light loosen mistake overrule overruled overruling overturn overturning problem redo redone repair repaired repairing repeal repealing replay reversal reverse reversing revise revised revising revision switch switched switching undo undoing undone unlock unlocked unravel unraveling warn warning