Anchor: A girl rides by on a bicycle while a boy watches her.
Entailed: There is a girl riding a bike
Contradiction: There is a girl watching a boy ride a bike
Contradiction: Most screening items have been used by clinical staff but not research staff.
Contradiction: For me, the major factor would be, if you were in a state where it was illegal. 
Contradiction: The Young Museum is an old company out of Richmond, Virginia.
Contradiction: Three men are waiting.