Anchor: A black dog carries a tree branch through the woods.
Entailed: A animal carries a tree branch .
Contradiction: A dog is playing in woods.
Contradiction: The children are actually at a real gas station in their toy cars.
Contradiction: There's only one way to get rid of the marriage penalty in a progressive tax system and that is to impose higher taxes on individuals. 
Contradiction: A man falls off a ladder.
Contradiction: People ride on a boat.