first, compare 6 and another 6. they must have difference. 公仔箱論壇+ }5 f! J" a% J0 f% D% q. \
second, divide those 6 heavier one into two, each has 3. u will find difference again.
( t" m( X$ M! y$ }9 Y2 I+ _5.39.217.77third time, if u put 2 and they are equal, u will know the different one.
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