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2 S, m* O m S1 Y" R2 n. ?答案:选一个囚犯出来负责关灯,其余的负责开灯,而且每人只能开一次,当这个囚犯关够99次的时候,就知道所有的囚犯都来过院子了。tvboxnow.com2 E$ Y4 ~/ p1 i, ^) C5 N' v, _8 p
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Can you make sure that is only 2 or 4 or 6......... to open the lamp? otherwise, the others do not know what station of the lamp!
& `6 N7 k1 u0 eplease see: jar 2009-01-07 my option: all can see and say the lamp is "on" that can sure everyboby have been to the gardon! |