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set1 = {"a", "b", "c"}
set2 = {1, 2, 3}
set3 = {"John", "Elena"}
set4 = {"apple", "bananas", "cherry"}
myset = set1.union(set2, set3, set4)
print(myset)
{1, 'a', 3, John, apple, cherry, 2, 'b', banana, Elena, 'c'}