premise: A man wearing only a hat, boots, and underwear is walking the sidewalk with a guitar strapped around his shoulder. hypothesis: A man wearing only a hat, boots, and underwear is licking the sidewalk.
contradiction: One is either walking on the sidewalk or licking the sidewalk.|contradiction: He cannot be walking on the sidewalk and licking it at the same time.|contradiction: A man cannot be licking the sidewalk if he is walking on it.