Anchor: A buy skateboarding at a skate park.
Entailed: a guy skateboarding
Contradiction: a guy swimming.
Contradiction: The young and pure cannot aspire to moral clarity because of their age.
Contradiction: The employees of the bureaus might not be able to go to these types of events.
Contradiction: I do not want to know how you feel about relocating jobs to Mexico.  
Contradiction: There are animals by water.