premise: A man in a mask in the back of a service vehicle. hypothesis: A woman is showing her head while riding on a horse.
contradiction: ITs either a man or a woman. The person is either showing their head or not . They cannot be on a horse and riding a service vehicle at the same time.|contradiction: A man in a mask is not a woman showing her head.  Also the back of a service vehicle is very different then rising a horse.|contradiction: There can be either a man or a woman.