Anchor: a person on a bicycle launching off a dirt ramp on a track.
Entailed: A person on a bicycle on a track.
Contradiction: A person on a motorcycle launching off a ramp on a track.
Contradiction: Two dogs are chasing a cat.
Contradiction: I apologize, what?
Contradiction: The man is riding the bicycle.
Contradiction: Riordan was endorsed by the Central Labor Council.