Anchor: A man is sliding down a huge sand dune on a sunny day.
Entailed: A man is sliding down a sand dune.
Contradiction: A man is tanning a top a huge sand dune on a sunny day.
Contradiction: A man is running down a sand dune on his hands.
Contradiction: A man is trying to drive over a sand dune.
Contradiction: A man is sliding down a huge sand dune on Mars.
Contradiction: The park is full of people.