premise: Two men, one with goggles, are swimming next to each other. hypothesis: A man eats a croissant on a bridge.
contradiction: There are three men one with googles, one without googles swimming next to each other. while another man eats a  croissant on a bridge. Or there are two men swimming next to each other and only one of them ahs googles. and there is no manon the bridge eating a croissant on the bridge.