premise: A boy in a yellow t-shirt and pink sweater talks on a cellphone while riding a horse through a crowd of people who are looking on. hypothesis: A boy has a white t-shirt and pink sweater.
contradiction: The boy who had a yellow t-shirt and pink sweater talking on a cellphone is not wearing white t-shirt and pink sweater.|contradiction: One does not generally wear a yellow t-shirt and a white t-shirt at the same time.|contradiction: yellow t-shirt is not white t-shirt.