Anchor: A man is using a jackhammer to work on a sidewalk.
Entailed: A man uses a demolition hammer on a sidewalk.
Contradiction: A man sits on a couch.
Contradiction: A man is using a jackhammer to work on the road.
Contradiction: A man is sitting in his car.
Contradiction: A man is using his jackhammer to wreck a house.
Contradiction: The man is taking a break from working on the sidewalk.