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- a1 = {'a', 'b', 'c'}
- a2 = 'b'
- print(a1.difference(a2))
- #Wynik {'a', 'c'} - OK
- b1 = {'aa', 'bb', 'cc'}
- b2 = 'bb'
- print(b1.difference(b2))
- #Wynik {'aa', 'cc', 'bb'} - WTF?
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