class MyHashSet:
myset = set()
def __init__(self):
self.myset = set()
def add(self, key: int) -> None:
return self.myset.add(key)
def remove(self, key: int) -> None:
return self.myset.discard(key)
def contains(self, key: int) -> bool:
return (key in self.myset)
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