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i know!5.39.217.77:8898% o6 c# q9 }/ P' K2 K- M
when they can have 15 mins discussion.
1 Z; ~$ B* c9 Tmake 1 of them to do a specific job whcih is counting公仔箱論壇$ L6 e( n  f/ y3 {+ t% ^
only him can turn on off off the light.tvb now,tvbnow,bttvb0 a( Y8 m: V* W  g) y5 P/ k
Basically, if you are the first time to get in the room, turn on the light, 5.39.217.77:8898# S" k9 E2 }2 A4 {6 D$ D
then wait for "the special man" to turn the light off....tvb now,tvbnow,bttvb9 O/ o- x8 F( N. t; _% r
when "the special man" count in up to 30 (included himself)tvb now,tvbnow,bttvb: R) ^  v8 L: s% `  n/ v. ]1 A
then it is done!