Anchor: plant that emits 0.1 pounds of mercury and a plant that emits 2000 pounds of mercury - regardless of cost - is neither efficient nor necessary.
Entailed: Plants that emit mercury are not necessary.
Contradiction: Mercury producing plants are the most efficient kind.
Contradiction: The boy is walking barefoot through the green grass.
Contradiction: Someone is leaning against a snowbank.
Contradiction: There isn't a state on Earth that practices any form of socialism.
Contradiction: The three people dressed as scientists are getting their picture taken.