Anchor: The rock star is playing his guitar while he is singing.
Entailed: The guitar was being played.
Contradiction: The rock star was sitting at his sewing machine.
Contradiction: The national business travel association didn't care about frequent flyer traveler programs. 
Contradiction: It was bought in the spring season, but the summer sun killed the tree.
Contradiction: The man's mother was nowhere to be found.
Contradiction: You do? I heard that is a good program.