Anchor: Two boys race on ice skates while others watch.
Entailed: Two boys are exerting energy to move across the ice.
Contradiction: Two boys are rollerblading on ice.
Contradiction: There are no performers.
Contradiction: A man in a blue sweater and black leather jacket standing in the center of a group of people.
Contradiction: Biolermakers thrived in the 1990s as employment surged in the field.
Contradiction: People dance.