print repr("abba")
print repr(set([1, 2, 3, 4]))
print eval(repr(set(range(4)))) == set([0, 1, 2, 3])
# repr(Wielomian('3*x^2 + 2*x + 3')) == "Wielomian('3*x^2 + 2*x + 3')" na przyklad
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