Anchor: Two men wearing black shirts sing and play the guitar.
Entailed: Two men are making music.
Contradiction: Two men in white shirts play guitar and sing.
Contradiction: My son did great in his math class. 
Contradiction: Tojimbo and Sotomo are two locations that are known by columnar rock formations
Contradiction: They are easy going and relaxed.
Contradiction: A man has his hand in a machine.