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nullify [nullified, nullifying, nullifies]▼(make legally invalid)verb[UK: ˈnʌ.lɪ.faɪ] [US: ˈnʌ.lə.ˌfaɪ]
undo [undid, undone, undoing, undoes]▼(to reverse)verb[UK: ʌn.ˈduː] [US: ʌn.ˈduː]
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