Anchor: Two people are playing instruments; one is playing a guitar, while the other is playing the drums
Entailed: Two people play musical instruments.
Contradiction: The marching band featured 76 trombones in a big parade.
Contradiction: Two boys are alone outside.
Contradiction: The Washington lawyer who laid everything out is married to a Slate editor. 
Contradiction: This maintenance is not expensive.
Contradiction: A man is biting apples that are floating in water.