i find one solution that is similar
7 ]9 d7 N" F2 N! i: q6 Mtvb 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 r2 a! B9 o" m7 I" x% M
maybe there is a better one, let me see sin |