Anchor: This person is performing a trick in skateboarding competition, with people watching in the background.
Entailed: Multiple people are observing the skateboarder.
Contradiction: The skateboard performer looking at the people.
Contradiction: A man is riding BMX.
Contradiction: A dog is skiing.
Contradiction: A person is practicing on his skateboard, alone in his backyard.
Contradiction: Everyone is watching a circus elephant on a skateboard.