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.
All dictionaries are useful books.
Therefore, it is false that no dictionaries are useful books. Use the traditional square of opposition, together with conversion, obversion and contraposition to prove that the following arguments are valid. Show each intermediate step in the deduction. No feminists are male chauvinist pigs. Therefore some advocates of equality are not anti-feminists.