set들끼리의 집합
교집합
a = set()
b = set()
1) set.intersection(a, b)
2) a.intersection(b)
합집합
a = set()
b = set()
1) set.union(a,b)
2) a.union(b)
a = set()
b = set()
1) set.intersection(a, b)
2) a.intersection(b)
a = set()
b = set()
1) set.union(a,b)
2) a.union(b)
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