Premise: "A boy in a winter coat and pants props himself up against a tree in some snow."\nHypothesis: "The boy is wearing swimming trunks."\nDo we know that the hypothesis entailed by the premise?
Let’s work this out in a step by step way to be sure we have the right answer.
no
It is unlikely for the boy to be wearing winter coat and pant while also wearing swimming trunks.

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So, the final answer is no