Anchor: Three people stand on a basketball court as a ball flies through the air.
Entailed: People are playing basketball.
Contradiction: Four people are running on a soccer field.
Contradiction: Ligurian pirates and warlike tribes quickly surrounded the merchants, preventing anyone from leaving the city.
Contradiction: You want your sword. 
Contradiction: The kids are playing with a ball in a park.
Contradiction: There is a wasp painted on the roof.