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Insiemi: Â differenza
>>> a = set('abracadabra')
>>> a

set(['a', 'r', 'b', 'c', 'd'])
>>> b = set('alacazam')
>>> b

set(['a', 'c', 'z', 'm', 'l'])
>>> a.difference(b)

set(['r', 'b', 'd'])
>>> a - b

set(['r', 'b', 'd'])
122