Source: Computational Materials Science, Volume 267
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Carson Schmidt and his friend spotted the man in distress after noticing a pair of skis protruding from the snow. The pair sprang into action, digging him out before he suffocated.
Thinking Step 3: 推理第二个人。他听到了第一个人的话，推断出第一个人想要。如果第二个人自己不想要，他会说“不”。他说“不知道”，说明他自己也想要，但他不确定第三个人。
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