first, compare 6 and another 6. they must have difference.
: T2 z! t" g2 l+ \2 Q8 @second, divide those 6 heavier one into two, each has 3. u will find difference again.4 r) g6 ~9 b6 [ g1 |( _
third time, if u put 2 and they are equal, u will know the different one.
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