Anchor: Two men sit on a pontoon boat holding oars and wearing hats.
Entailed: two men are in a boat.
Contradiction: 1 man is asleep in his boat.
Contradiction: The man is playing a video game.
Contradiction: If you are in search of second-hand trinkets, explore the shops near the Piazza Navona. 
Contradiction: A group of dogs gather around a large fountain.
Contradiction: Tommy stopped breathing out.