first, compare 6 and another 6. they must have difference.  
, m( C* Q% G5 w  U* @tvb now,tvbnow,bttvbsecond, divide those 6 heavier one into two, each has 3. u will find difference again.2 j% T- i# ~2 C. |8 r1 f 
third time, if u put 2 and they are equal, u will know the different one.tvb now,tvbnow,bttvb/ @1 p4 H1 K. ^% P; I& P' I 
so easy.... |