Anchor: The buzz on Pfizer's forthcoming potency pill, Viagra, is so good that the company's stock has already soared 74 percent.
Entailed: The buzx on Viagra is so huge that Pfizer's stock increased 74%.
Contradiction: There was no buzz on Viagra, stock remained the same. 
Contradiction: A girl is playing on the swings.
Contradiction: I read a book in the Austin Room of my B & B.
Contradiction: Tuppence flew into a window on the third floor. 
Contradiction: Von Hoffman wrote about Horowitz.