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assert 1 + 1 == 2 assert 1 - 1 == 0 assert 1 * 1 == 1 assert nat(1 / 1) == 1 assert 1 % 1 == 0 assert 1 ** 1 == 1 assert 1 in [1, 2] assert 1 in (1, 2) assert 1 in {1, 2} assert 1 in {1: 2} assert 1 in 1..2