| Choose a person to do the record and his mission is to record the total number of open switches when he go outside. Other persons' tasks are turn the light off when they see the switch is turned on. However, each person can only switch the light off once. Next time, no matter the light is on or off, don't do anything. When total of 100 times of the "switch off" count. it shows that 100 people visited. |
發表於 2012-7-2 01:27 PM
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