Anchor: Every kid at school knew about the Trenchcoat Mafia, but Columbine adults were unaware of its existence.
Entailed: Columbine adults and teens had different knowledge of current culture. 
Contradiction: Everyone in Columbine both old and young was familiar with the Trenchcoat Mafia.
Contradiction: Very few of them end up in jail with the death penalty hanging over them.
Contradiction: Two men doing something.
Contradiction: The boats stay at the dock overnight.
Contradiction: Two people have stopped on their bikes.