Anchor: A man on a skateboard does a trick on a ramp.
Entailed: A guy on a skateboard goes on a ramp and does a trick
Contradiction: A guy on a skateboard goes on a ramp and falls
Contradiction: John is the unknown underdog going into the fight.
Contradiction: the man is bowling
Contradiction: The doctors are playing golf.
Contradiction: Even though I looked in the same direction as he did, I did not observe anything weird.