Anchor: They used various techniques to do this, and several mentioned their efforts to identify, evaluate, and implement new, more effective tools as they become available.
Entailed: They used many different ways as tools became available.
Contradiction: They used the same techniques and the same tools.
Contradiction: A man is drinking coffee at the restaurant.
Contradiction: Sikhs once were persecuted near the hall.
Contradiction: Students, regardless of the school they go to, find each possible difference the same difficulty to deal with. 
Contradiction: New Orleans supported the American Revolution.