Anchor: A S.C.U.B.A. diver swims in deep blue water.
Entailed: In the deep blue water a S.C.U.B.A. diver is swimming.
Contradiction: A S.C.U.B.A. diver is running in a field.
Contradiction: This is the fastest machine, you won't find a better machine.
Contradiction: A man catches a ball.
Contradiction: I am John Johnson. 
Contradiction: There is a person outside.