i find one solution that is similar8 E: ^* y/ A7 S( u3 `# p: |, o
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....tvb now,tvbnow,bttvb, u& v) @' S- I) h. ]2 k
maybe there is a better one, let me see sin |