def test_ordered_set_intersection(): assert list(ordered_set_intersection([[1, 2]])) == [1, 2] assert list(ordered_set_intersection([[1, 2], [2, 1]])) == [1, 2] assert list(ordered_set_intersection([[1, 2], [1, 3]])) == [1] assert list(ordered_set_intersection([[1, 2], [2]])) == [2]