Anchor: Sam reached up against the bar, squirmed around, the book still in his hand.
Entailed: Sam stretched up against the bar, still holding the book in his hand.
Contradiction: Sam reached up against the bar, still petting the cat.
Contradiction: A snake eats a rat.
Contradiction: The experience persuaded him to leave his family and become a beggar. 
Contradiction: the person is naked
Contradiction: People sitting outside