Anchor: A person riding their bicycle up a dirt mound while two other people are in the background watching.
Entailed: A person is riding their bike on a dirt track.
Contradiction: a man drives a truck on the road
Contradiction: The bicycle rider does a trick with no one watching.
Contradiction: Three people are riding unicycles through flaming hoops.
Contradiction: A person is doing tricks on his skateboard for his friends.
Contradiction: a person flies a plane