Anchor: A person rides his mountain bike down a dirt road very fast.
Entailed: A person riding a bike is going very fast down a dirt road.
Contradiction: A guy is riding a mountain goat down a road.
Contradiction: I can't stand him.
Contradiction: A man is smiling.
Contradiction: A boy is running down a street.
Contradiction: The city moves too fast for those who are more comfortable with the familiar.