i find one solution that is similar公仔箱論壇: q' ~% }# P/ j5 o/ Y, v
but i can't specify the heavier one is abnormal or the lighter one is abnormal when the case that has only two balls left....
$ \! Z) G1 O5 P, @! x: |5.39.217.77maybe there is a better one, let me see sin |