First and second Premises are Particular Affirmative (I- type). Third and Fourth Premises are Universal Affirmative (A-type). Some umbrellas are raincoats All raincoats are trousers. I + A ⇒ I-type Conclusion ‘Some umbrellas are trousers’. Conclusion II is converse of this Conclusion. Some machines are computers All computers are televisions. I + A ⇒ I-type Conclusion Some machines are televisions. Conclusion I is converse of this Conclusion. Conclusions II and III form Complementary Pair. Therefore, either II or III follows.