premise: Two children are sitting on a white blanket, while the other child is sitting in the dirt. hypothesis: both of the children are sitting in dirt.
contradiction: All the children cannot be sitting in dirt if two of them are sitting on a white blanket.|contradiction: There are either 3 children, with one sitting in the dirt, or there are two children, both in the dirt.|contradiction: If one of the children is sitting on a white blanket then both of the children cannot be sitting in dirt.