def METHOD_NAME():
    constraints, instance_map = initialize_constraints(2)
    sequence_pairs = enumerate_sequence_pairs(constraints, instance_map, 100)
    assert len(sequence_pairs) == 4
    constraints, instance_map = initialize_constraints(4)
    sequence_pairs = enumerate_sequence_pairs(constraints, instance_map, 1000)
    assert len(sequence_pairs) == 576
    constraints, instance_map = initialize_constraints(20)
    sequence_pairs = enumerate_sequence_pairs(constraints, instance_map, 1000)
    assert len(sequence_pairs) == 1000
    constraints, instance_map = initialize_constraints(4)
    with set_context(constraints):
        constraints.append(constraint_schema.Order(direction='left_to_right', instances=[f'M{i}' for i in range(4)]))
    sequence_pairs = enumerate_sequence_pairs(constraints, instance_map, 1000)
    assert len(sequence_pairs) == 1
    assert sequence_pairs[0] == ([0, 1, 2, 3], [0, 1, 2, 3])
    constraints, instance_map = initialize_constraints(4)
    with set_context(constraints):
        constraints.append(constraint_schema.Order(direction='top_to_bottom', instances=[f'M{i}' for i in range(4)]))
    sequence_pairs = enumerate_sequence_pairs(constraints, instance_map, 1000)
    assert len(sequence_pairs) == 1
    assert sequence_pairs[0] == ([0, 1, 2, 3], [3, 2, 1, 0])