premise: 3 man on a boot one with dark sungalsses and gray hair and gray shirt sitting inside the building, one going has very little hair green and white checked shirt blue jeans and a wristwatch on his left hand, sitting behind a rail, The other bald in all black but a white logo on his shirt leaning on the rail. hypothesis: There are no men.
contradiction: There cannot be no men if there is a man with sunglasses and another who is bald.