i find one solution that is similar3 i* C5 M5 v- G/ I6 `
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..../ W2 i% N5 @$ b! J
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...