Anchor: A man wearing a black helmet and black pants and shirt rides his skateboard in a park.
Entailed: The man is riding his skateboard.
Contradiction: The man is not wearing a helmet.
Contradiction: A woman in a white dress is standing at the altar
Contradiction: Two people are hiking and enjoying it.
Contradiction: I know everything there is to know about it.
Contradiction: I'm uncertain about whether we are seeing the effects already.