Anchor: People sitting on the ground listening to someone talk.
Entailed: People are sitting on the ground.
Contradiction: People are sitting on the round having a picnic in the rain.
Contradiction: Mercury can only be found at the bottom of the ocean.
Contradiction: The wine from the island was enjoyed until the Phylloxera disease killed the vines.
Contradiction: A person performs stunts with a skateboard.
Contradiction: A snowboarder is on a mountain.