Anchor: A meeting is going on and there are potato chips and Coke on the table.
Entailed: A meeting with snacks.
Contradiction: A child does his times tables.
Contradiction: The group was not allowed to stage a rally in Texas.
Contradiction: Proper RFPs are critical elements of successful acquisition as they are part of the binding contract. 
Contradiction: The man is outside.
Contradiction: A boy is at the playground.