Anchor: Then, sir, consider that for a long time our astronomers have believed that two general classes of planetary bodies existed.
Entailed: Our astronomers used to think there were two classes.
Contradiction: Our astronomers have always believed there are only two classes.
Contradiction: The dog is playing with a frog.
Contradiction: There is a French War Memorial and a statue of Gandhi on opposite sides of the road. 
Contradiction: Two girls wearing life jackets on a boat.
Contradiction: The original miniskirt belonged to men then women stole it.