Anchor: What, you may ask, is the key difference between chemical and biological weapons?
Entailed: What is the main difference between weapons of chemical composition, and those of biological composition?
Contradiction: There are no differences between chemical and biological weapons.
Contradiction: A baseball player on the bench.
Contradiction: The papers are scaling back their content.
Contradiction: After conquering the islands, they were left unnamed for many years.
Contradiction: A construction worker hammering a nail.