Anchor: A teenage boy doing a skateboard trick while another boy rides on a skateboard in the background.
Entailed: some boys are riding skateboards
Contradiction: the boy is doing tricks on his bmx bike
Contradiction: Each population group is always better with its own, larger kind.
Contradiction: Someone shovels a path during a snowstorm.
Contradiction: The dog is sitting.
Contradiction: Some roles are more complex than others.