def drop(self, key, value):
        self.keyVal[key].discard(value)
        if not self.keyVal[key]:
            del self.keyVal[key]
        if value not in self.valKeys:
            self.valKeys[value].discard(key)
            if not self.valKeys[value]:
                del self.valKeys[value]
dataset/ETHPy150Open ufora/ufora/ufora/util/TwoWaySetMap.py/TwoWaySetMap.drop/operator `in` -> `not in`