| tvb now,tvbnow,bttvb,tv series,tv drama,movie,bt,download- M  u! [! N% _7 @ # q; ^6 |8 T& ]+ N, a* w- W公仔箱論壇210.6.90.151  H; Y- n+ `4 E" w$ ^, E
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 7 u& \/ c  `+ X; S: T6 ptvb now,tvbnow,bttvb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。
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 + ^8 S% A! O  t& w; h& P公仔箱論壇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!  5.39.217.77/ D8 {% Q! F- G
 please 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!
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