premise: An old man, likely a blacksmith, is welding a tool, seen by the red hot scorching look of it. hypothesis: A farmer is milking the cow.
contradiction: Either the person is welding a tool, or milking the cow. Cannot be doing both.|contradiction: The man is either a farmer milking the cow or a blacksmith is welding a tool.|contradiction: A man is either a blacksmith or a farmer. He is either welding or milking.