premise: Two boys are looking upwards with their arms streteched to the sky, the boy on the left is wearing a blue vest jacket with a gray long-sleeved shirt and black jogging pants, and black tennis shoes and a hat, and the boy on the right is wearing a silver vest jacket, with blue long-sleeved undershirt, gray pants, and black tennis shoes and has black short hair and glasses. hypothesis: The two boys have never been outside.
contradiction: Sky and never been outside are contradictory because you need to be outside to get a good view of the sky.