Anchor: People on skateboards racing around a track.
Entailed: People using skateboards on the street.
Contradiction: People on roller skates on the sidewalk.
Contradiction: The little boy went down the slide
Contradiction: A good looking lady climbs over an enclosure.
Contradiction: There is no method with which SO2 can be controlled.
Contradiction: You're not wrong; I did oversimplify some things regarding Bush.