Anchor: A child with a sled plays in the snow at dusk.
Entailed: A child is outside at dusk.
Contradiction: A child is pulling the tree through the snow.
Contradiction: You weren't able to do anything about it. 
Contradiction: Bork had no idea what the answer to the question was.
Contradiction: Birds are flying in the sky.
Contradiction: The children laugh as they slide in the snow.