Anchor: A man sits behind a music stand playing the guitar while people perform in the background.
Entailed: The man is playing the guitar.
Contradiction: A man stands in front of a stand as people perform in front of him.
Contradiction: The man is playing a tuba.
Contradiction: A man is sitting at a computer.
Contradiction: The man is standing in front of people performing.
Contradiction: He prepares for his accordian solo