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i know!
' j7 R( ]: y+ O; l6 I公仔箱論壇when they can have 15 mins discussion.
7 ^1 }6 X6 c) Z1 X( i7 x' Bmake 1 of them to do a specific job whcih is counting公仔箱論壇& X. g$ u& i& e2 h  [; ?9 J+ E/ @
only him can turn on off off the light.
" V) m% y. n1 N% O5.39.217.77:8898Basically, if you are the first time to get in the room, turn on the light, % s" S3 t5 h8 L6 T- @3 h$ B6 K
then wait for "the special man" to turn the light off....tvb now,tvbnow,bttvb1 L" n* w9 u; }  D' g
when "the special man" count in up to 30 (included himself)
9 }" u8 c' P7 l* Q8 N3 Qthen it is done!