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i know!
) M5 x: M7 P% h9 xwhen they can have 15 mins discussion.5.39.217.76, R9 D- a. b/ D( `
make 1 of them to do a specific job whcih is counting
) g) ^2 @: i# \+ Uonly him can turn on off off the light.
9 E5 J. t, z. E' W+ T6 G公仔箱論壇Basically, if you are the first time to get in the room, turn on the light, $ Y8 m6 \8 C& E1 r
then wait for "the special man" to turn the light off....5.39.217.767 _0 E/ }# V( y; L- g- E: @# d$ O
when "the special man" count in up to 30 (included himself)7 M% n/ |" H* H0 y# P7 b% v, T
then it is done!