i find one solution that is similar
* ]- K0 {0 L- w. ?# dtvb now,tvbnow,bttvbbut i can't specify the heavier one is abnormal or the lighter one is abnormal when the case that has only two balls left....
# @; |3 n" Z- g2 K8 o/ r公仔箱論壇maybe there is a better one, let me see sin |