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put 3 balls on each side,
- y+ w3 u9 o* d  R% oif balance, we can prove that all 6 balls on the 天平 is normal, tvb now,tvbnow,bttvb5 ^$ ]! n7 ?' z9 }; l  o
if not balance, we can prove that the 6 balls outside the 天平 is normal.
  H6 o) y- J" z0 ^TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。then use the proved-normal ball on one side and put the other ball on other side
$ z6 S, j8 ~" B7 g5.39.217.77to determine the abnormal is heavy and light