premise: A newspaper delivery man smiles as he walks down a sidewalk holding his papers on top of his head. hypothesis: This person's only job is being a welder on an oil rig.
contradiction: If his only job is being a welder, he cannot be a newspaper delivery man.|contradiction: This person is either a newspaper delivery man or a welder on an oil rig.|contradiction: The newspaper delivery man cannot also be a welder on a oil rig.