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>>> setA = set(["John", "Bob", "Mary", "Serena"])
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>>> setB = set(["Jim", "Mary", "John", "Bob"])
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>>> setA ^ setB # symmetric difference of A and B
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set(['Jim', 'Serena'])
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>>> setA - setB # elements in A that are not in B
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set(['Serena'])
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>>> # and so on...
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