Anchor: Of these, the Dordogne has carved a particularly beautiful winding valley of gentle greenery.
Entailed: There is a valley of gentle greenery carved by the Dordogne.
Contradiction: The valley carved by the Dordogne is not one of these.
Contradiction: A nationally televised cross-examination is easy to conduct.
Contradiction: Two women are crossing a street.
Contradiction: That sounds dull. 
Contradiction: There is a group of excited young people.