Anchor: Two guys, one playing a guitar, the other a keyboard.
Entailed: Two guys are playing musical instruments.
Contradiction: Two guys, one talking on his cellphone, the other a computer game.
Contradiction: It is impossible to get information on a single person.
Contradiction: The plan is to take a look in the evening.
Contradiction: I heard a knocking sound.
Contradiction: An old woman is gesturing at vegetables.