Anchor: A sonic boom struck through the train as it hit a tunnel.
Entailed: The train hit the tunnel and there was a sonic boom. 
Contradiction: It was silent as the train entered the tunnel. 
Contradiction: The nuns do not make any effort to protect their seclusion and visitors can come and go whenever they wish, without having to obtain permission.
Contradiction: The train slowed down near towns.
Contradiction: A boy is petting his dog.
Contradiction: Girl needs a car wash.