Anchor: Statistical sampling would only be needed for monitoring the system operations through periodic testing.
Entailed: Monitoring the system operations through periodic testing would need statistical sampling.
Contradiction: Monitoring the system operations through periodic testing would not need statistical sampling at all.
Contradiction: A person is getting ready to lift the bus off the ground
Contradiction: People walk on a street.
Contradiction: A boy flies away on the back of a falcon toward the big mountain.
Contradiction: A musical event is going on.