premise: There is a little blond-hair girl with a green sweatshirt and a red shirt playing on a playground. hypothesis: There is a little blond-hair girl with a blue sweatshirt and an orange shirt sitting next to the playground by herself.
contradiction: Sentence 1 states a greet sweatshirt while sentence 2 states a blue sweatshirt.  Sentence 1 states a red shirt and sentence 2 states an orange shirt.  These colors of greet and red and blue and orange are not the same colors of clothing.  Sentence 1 states the girl is playing and sentence 2 states that she is sitting.  Playing and sitting are not the same actions.