Anchor: Passersby watch as a person on Roller-blades goes down a large incline.
Entailed: A person is rollerblading down a hill while others watch.
Contradiction: A person on rollerblades struggles uphill while others watch.
Contradiction: My sister didn't buy anything. 
Contradiction: a dog in a race
Contradiction: A dancer is doing the worm on a street corner.
Contradiction: agency managers are in the best position to assess the risks associated with their programs