i find one solution that is similar
. p2 K% o- m3 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....公仔箱論壇0 O5 ]9 ]: @5 a3 `/ F
maybe there is a better one, let me see sin |