how about this

来源: 我是反革命 于 2010-01-07 16:53:49 [] [旧帖] [给我悄悄话] 阅读数 : (221 bytes)

If any guy sees only one pair, he walks to the side. Once one guy walks to the side, nobody else walks.

The rest look at each other. Whoever still only sees one pair, has the same count as the guy who walks aside.

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