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>>> setA = {"John", "Bob", "Mary", "Serena"}
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>>> setB = {"Jim", "Mary", "John", "Bob"}
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>>> setA ^ setB # symmetric difference of A and B
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{'Jim', 'Serena'}
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>>> setA - setB # elements in A that are not in B
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{'Serena'}
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>>> setB - setA # elements in B that are not in A
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{'Jim'}
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>>>
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