stupid818

first, compare 6 and another 6. they must have difference. , B6 ]4 u( x  ]) O
second, divide those 6 heavier one into two, each has 3. u will find difference again.
9 u6 ~6 f1 V* e5 n! q9 u公仔箱論壇third time, if u put 2 and they are equal, u will know the different one.
% `7 S) R( B! i- u$ G$ atvb now,tvbnow,bttvbso easy....