Anchor: The surfer rides a blue board on a bright blue wave.
Entailed: The surfer rides bright blue wave.
Contradiction: the surer not rides
Contradiction: The obituary did not contain any fondness, there was nothing heartfelt or worth noting, 
Contradiction: Two people are sitting.
Contradiction: A pair of people are dancing on the boat.
Contradiction: Is there a trick of using oxygen that life has figured out?