Anchor: He spotted a big generator working busily--and then saw a gang of about fifty men, or mandrakes, turning a big capstan that kept it going.
Entailed: He saw many men powering the generator. 
Contradiction: He saw one man powering the generator. 
Contradiction: The airline knew exactly what to do.
Contradiction: the man has something on his wrist.
Contradiction: The two people were arguing with each other
Contradiction: Exxon Texaco is a big one around here.