Anchor: A surfer works his board in the pristine blue ocean.
Entailed: A person is in the water on a surfboard.
Contradiction: A person is piloting a kayak.
Contradiction: A skateboarder sets down his board below the bleachers.
Contradiction: We believe that this answers your inquiry.
Contradiction: Video poker is not addicting, smoking crack is better.
Contradiction: The kid is riding north so he can make a big brag.