Anchor: Four men socializing on a sidewalk.
Entailed: Four men are talking on a sidewalk.
Contradiction: Two men socialize at a cafe.
Contradiction: The Acid Rain Program tries to increase nitrogen oxides.
Contradiction: I asked Alfred if he would write to the princess.  
Contradiction: He quietly turned down the offer without even thinking about it. 
Contradiction: When I discovered that the harder I tried to exonerate him, the harder he tried to bring about his own arrest.