Anchor: A group of people ride in a race
Entailed: A group of individuals are participating in a riding race.
Contradiction: A girl is riding her bike along the walk path of a park.
Contradiction: My husband never gets a call while he is at work.  
Contradiction: Two people are concealing themselves.
Contradiction: Two young women are running through the grass in the fall.
Contradiction: A guy is sweeping outside on the wet brick floors while wearing a raincoat and a white hat.