Since I need to change the quantity too, contradictory suggests itself. If I change the quality, that will be a good thing because then I'll be able to do obversion to get the term compliment of P. That will change the quality back to affirmative. If not, state the fallacy committed. Some pirates are daring men. Therefore, some pirates are not daring men.
Some wasps are unfriendly insects.
Therefore, it is false that no wasps are unfriendly insects. It is false that all professors are ignorant fools. Therefore, no professors are ignorant fools. It is false that some muffins are not wholesome foods. Therefore, some muffins are wholesome foods.