i find one solution that is similar8 F; n6 z6 x$ y; i0 w) @9 K
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....: W& Q. {( Z) H+ A' O
maybe there is a better one, let me see sin
actually this question always have someone asked, the calculation is very complicated, should give a no. of each ball, and first weight it in 6-6, and .... forgot...