Premise: "A man is a white sweater is sitting at a desk using a computer."\nHypothesis: "He is working."\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.
it is not possible to tell
Just because he' s sitting at a desk using a computer does not mean he's necessarily working.

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So, the answer is it is not possible to tell