Please answer the following question by reasoning step-by-step. Premise: "Three workmen wearing safety hats stand in front of a tractor designed for hauling a large tunnel tube."\nBased on this premise, can we conclude that the hypothesis "The men are letting their hair flow free." is true?\nOptions:\n- yes\n- it is not possible to tell\n- no. Step-by-step reasoning:
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Three workmen wearing safety hats cannot let their hair flow free. So the answer is no.
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