All times a rainbow occurs are times the sun is shining. All persons who suffer allergic reactions are persons with a weakened immune system. No pineapples are fruits that ripen after they are picked, and all nonpineapples are fruits that ripen after they are picked. Some corporate raiders are persons known for their integrity, and some corporate raiders are not persons known for their integrity. Some monkeys are animals found in the jungles of Guatemala.
All monkeys are mammals.
All persons identical to me are persons who like strawberries. Some third generation computers are machines that take dictation. All cars that yuppies drive are BMWs. No cartilaginous fishes are vertebrates with a bony skeleton, and all vertebrates that are not cartilaginous fishes are vertebrates with a bony skeleton. No downhill skiers who suffer from altitude sickness are effective competitors.