premise: A man in an orange hat holds a ball. hypothesis: A man in a blue hat drops the ball.
contradiction: The man can be wearing either an orange or a blue hat. One cannot hold a ball and drop it at the same time.|contradiction: The man can't be wearing an orange hat and a blue hat at the same time, he also can't hold a ball and drop the ball at the same time.|contradiction: The hat is either orange or blue.