premise: A young girl in a white t-shirt and a blue skirt wearing a light colored hat stands in a river next to a big rock. hypothesis: The girl is swimming in the river.
contradiction: The girl can't be standing and swimming at the same time.|contradiction: A girl in a river next to a big rock cannot be swimming in the river.|contradiction: She cannot be swimming while she stands.Girls wear swimsuits to swim, not a skirt and hat.