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i know!os.tvboxnow.com( [/ K' d3 h  \6 n, @
when they can have 15 mins discussion.8 [+ b# A/ A) y9 i& A5 w' s
make 1 of them to do a specific job whcih is counting
! I( o2 w1 r2 L# l+ q公仔箱論壇only him can turn on off off the light.
6 b, i) ~4 _, z& i5 U* w  q1 B* dtvb now,tvbnow,bttvbBasically, if you are the first time to get in the room, turn on the light,
1 F' M* q/ r* I7 t( ]  K; Hthen wait for "the special man" to turn the light off....os.tvboxnow.com, d; e4 _& F! b* c7 B& u. ?" k
when "the special man" count in up to 30 (included himself)
; l$ ^* ]* |" B! k8 ?2 b7 T# X公仔箱論壇then it is done!