Premise: "A young boy jumping into a pool that says ""no diving""."\nHypothesis: "A sad young boy jumping into a pool that says something about safety."\nDo we know that the hypothesis entailed by the premise?
Think hard. Detailed solution:
it is not possible to tell
Just because young boy jumping into a pool that says 'no diving' doesn't mean he is sad.

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Final answer: it is not possible to tell