first, compare 6 and another 6. they must have difference.
9 Z# u- c) S1 }second, divide those 6 heavier one into two, each has 3. u will find difference again.
. K" E' m7 [$ ]& o% ?4 Ktvb now,tvbnow,bttvbthird time, if u put 2 and they are equal, u will know the different one.
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