Anchor: Each summer local farmers and their dogs get together for a friendly competition; the dog and farmer maneuver sheep around a set course.
Entailed: Sheep herding competitions occur each summer.
Contradiction: Farmers and dogs do not have to work together to herd sheep. 
Contradiction: People swim in the pool together.
Contradiction: The surfer is near the beach
Contradiction: I told him to get out of here. 
Contradiction: Skateboarders are riding in a skate park.