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i know!
4 W! b% ^& Z- V/ g2 Fwhen they can have 15 mins discussion.5.39.217.767 X, A" R" U5 z
make 1 of them to do a specific job whcih is counting
- U( `8 r& Z! D9 A, f$ b1 n2 B5.39.217.76only him can turn on off off the light.& M+ K" w: L2 ]2 d7 r. L- M4 ?
Basically, if you are the first time to get in the room, turn on the light,
$ E4 l/ k; ~' c' sthen wait for "the special man" to turn the light off....
. i9 y6 m8 M" i8 O0 `when "the special man" count in up to 30 (included himself)
' K+ b% n* c+ a& }6 N; k& N7 a公仔箱論壇then it is done!