Anchor: A person skis down a snowy and tree-filled hill.
Entailed: A person skiing.
Contradiction: A person snowboarding down a ramp.
Contradiction: The sail boat doesn't need it's two large masts in order to move quickly.
Contradiction: A Malaysian person rides a bike on a trainer.
Contradiction: The man is mowing his yard.
Contradiction: There are at least three people together.