Anchor: His head was exactly the shape of an egg, and he always perched it a little on one side. 
Entailed: His head was a perfect egg-shape, and he always rested it on one side.
Contradiction: His head was a perfect square shape.
Contradiction: Boys sit in school.
Contradiction: The nation's stock of capital goods is increased today by saving and investing.
Contradiction: girl plays with dog
Contradiction: I didn't know about that.