put six on each side first
n$ S' @8 D! O' u {6 F7 {% I! `) _公仔箱論壇' E9 h3 V& [6 C8 T
from the heavier six, split it to three on each side5 v, E7 S8 ^, P6 d% P
" O5 }2 O" E. {7 [9 Y9 fthen there is three left, put one on each side, if one is heavier then that is it, if they are balanced then last one is heavy one |