Anchor: Yes, it was a clever idea! 
Entailed: What a smart idea!
Contradiction: No, it was a terrible idea.
Contradiction: Knowing what is going on in Paris is impossible because of the lack of guides. 
Contradiction: He cannot offer a coherent way to think about the issues.
Contradiction: Landsburg is an advocate of preserving redwood forests. 
Contradiction: If you added up all their ages it would not have equaled forty-five.