def test_FF_of_type():
    assert (FF(3).of_type(FF(3)(1)) is True)
    assert (FF(5).of_type(FF(5)(3)) is True)
    assert (FF(5).of_type(FF(7)(3)) is False)
def test_FF_of_type():
    assert (FF(3).of_type(FF(3)(1)) is True)
    assert (FF(5).of_type(FF(5)(3)) is True)
    assert (FF(5).of_type(FF(7)(3)) is False)