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thanks~~

Posted by cnhawk at 2007-04-01 12:57:51 on Problem 3211
In Reply To:Re:两人可以合作洗是什么意思? Posted by:frkstyc at 2007-04-01 12:54:55 
> yes, it can be done in 6 units of time. say, one person will wash the piece that requires 6 units of time, the other person will wash the rest
>
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