Anchor: There is a group of musicians sitting in wooden chairs each with a different instrument.
Entailed: The musicians are sitting with their instruments
Contradiction: The musicians are stabbing each other with their instruments
Contradiction: A group of people are all swimming in a pool.
Contradiction: He has his own point of view. 
Contradiction: I heard they got rid of flex time.
Contradiction: The belfry is 57 m high on the north side, less so on the south.