i find one solution that is similar+ g; T" n- j |" ?) 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* t2 |- Q8 D6 u" k) q `2 U( e! o2 x$ Q
maybe there is a better one, let me see sin |