Anchor: The man in gray trousers is playing a black guitar, and the man in blue jeans is playing a black and blue guitar.
Entailed: Two men are playing a guitar.
Contradiction: Two men are playing the drums.
Contradiction: My husband always hated golf and would never go with me when I played.
Contradiction: Two young humans play together.
Contradiction: They never arrived in the first place. 
Contradiction: It's never made sense to me for one twelve dollar check.