Anchor: Four dirt bike racers racing in sandy dunes going fast.
Entailed: Dirt bikes are racing on dunes.
Contradiction: Dirt bike racers are repairing their bikes.
Contradiction: The Old Man never went to the range.
Contradiction: A man is forcing his son to walk down the beach.
Contradiction: The neighborhood is full of people that I know. 
Contradiction: He got undressed and went to sleep until the next morning.