stupid818

first, compare 6 and another 6. they must have difference. 1 a6 O  h" Y5 W3 `6 L* Y# u
second, divide those 6 heavier one into two, each has 3. u will find difference again.
4 Y( T; O2 Z0 b+ vthird time, if u put 2 and they are equal, u will know the different one.
& }: b) J7 c7 z% k, A% B4 O( i2 f公仔箱論壇so easy....