Anchor: A snowboarder jumps while spectators watch.
Entailed: A snowboarder does some jumps.
Contradiction: People are at a surfing competition.
Contradiction: A boy floats on top of water.
Contradiction: The Thurston and Ito study helped understand the ozone.
Contradiction: The dog lays on the couch.
Contradiction: Three people sit in class while a woman stands in the front of the room.