Therefore, Some sailors are police officers. No honest people are haberdashers. Some haberdashers are horse riders. Therefore, Some horse riders are honest people. No minerals are organic materials.
Some organic materials are compounds.
Therefore, Some compounds are not minerals. All whales are mammals. No whales are birds. Therefore, All birds are mammals. This Lesson Go ahead to Next Lesson Return to Logic Syllabus 2000 Garth Kemerling.