premise: A man is holding a child on his shoulders. hypothesis: The child is too big to ride on the mans shoulders now.
contradiction: Either the child is on the mans shoulders or the child is too big to ride on the mans shoulders. Not both.|contradiction: The child cannot be riding on the man's shoulders if the child is too big to ride on the man's shoulders.|contradiction: The child cannot ride on the shoulders of the man and be too big to ride.