Anchor: A person skis through a forest of tall trees.
Entailed: There is a person sking through a forest.
Contradiction: A person water skis across the lake.
Contradiction: Two children look down while swimming.
Contradiction: It's pleasant to me to say I don't enjoy heat. 
Contradiction: The remaining cars must come to a stop, wherever they are on the track.
Contradiction: I would like you to offer me a palliative for my irritation.