premise: A group in uniform marches carrying red signs with Chinese lettering on them. hypothesis: a dog eats steak.
contradiction: A group in uniform is not the same as a dog, and the group carrying signs isn't anywhere near the same as eating a steak.|contradiction: Dog do not carrying red sign and participate in marches.|contradiction: While a group marches a dog eats steak. These are two thoughts independent of each other and no contradiction exists.