Anchor: He doesn't chew tobacco--I had to help him out a bit.
Entailed: He doesn't chew tobacco - thanks in part to me.
Contradiction: He still chews tobacco - none of my help was useful.
Contradiction: All that there is to discover has been found. 
Contradiction: A person wearing sunglasses is working out.
Contradiction: I know that it will be the best deterrent ever.
Contradiction: A person is climbing a wall.