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i know!. {3 z( X& q8 @7 u" j
when they can have 15 mins discussion.7 b7 ^5 Q9 O5 {
make 1 of them to do a specific job whcih is counting
& T' B/ J7 e( P3 Honly him can turn on off off the light.5.39.217.77:8898* F1 Y0 W# N& l- C
Basically, if you are the first time to get in the room, turn on the light, 5.39.217.77:88988 i+ v2 i6 f+ ?
then wait for "the special man" to turn the light off....
4 G, B- ]$ D/ L9 dwhen "the special man" count in up to 30 (included himself)
2 ^7 X$ Z8 X9 E  o: z9 \5 S$ P公仔箱論壇then it is done!