Please help this familiy to cross to the other side of the bridge. notice that: it is night. there is only one lamp. a maximum of 2 persons can cross at one time, and they must have the lamp with them. each person walks at a different speed: 1 sec, 3 sec, 6 sec, 8 sec and 12 sec. a pair must walk together at the rate of the slower person. the lamp enough for 30 sec only!!
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