Anchor: Young boy in blue jacket learns to ride a skateboard.
Entailed: A human in a jacket.
Contradiction: Nobody has a jacket.
Contradiction: You are an attentive audience, and will sit enraptured at my every word.
Contradiction: The boys are playing.
Contradiction: Boys take a test at school.
Contradiction: 5 men are plating soccer on the beach with their other equipment sitting aside them.