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i find one solution that is similar
  Q" ^$ J* K& F5 h) |tvb 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....8 n* j4 B) s' C3 A. Q. U: _  G
maybe there is a better one, let me see sin
it is already good IQ if you can understand the answer......
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