Anchor: A youth riding a skateboard is airborne amongst the basketball courts.
Entailed: A kid on a skateboard is outside.
Contradiction: A kid is riding a bike at the courts.
Contradiction: A man is sleeping at home.
Contradiction: Nobody knows more about poisons than he does, i explained.
Contradiction: I'll never take it away from you. 
Contradiction: W) Indicates inventions financed with Federal funds to which the government has patent rights.