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"4. undo - Undo the last operation of type 1 or 2 , reverting S to the state it was in prior to that operation." and for further clarity it could be added "(it could reach its initial empty state)."
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Point 4 is worded confusingly, I'd put it as:
"4. undo - Undo the last operation of type 1 or 2 , reverting S to the state it was in prior to that operation." and for further clarity it could be added "(it could reach its initial empty state)."