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put 3 balls on each side,
$ \$ r# R! s  |if balance, we can prove that all 6 balls on the 天平 is normal, tvb now,tvbnow,bttvb6 s0 |% r7 S* h% i# a
if not balance, we can prove that the 6 balls outside the 天平 is normal.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。) P& A4 ]9 ~: ~% \6 b7 Z
then use the proved-normal ball on one side and put the other ball on other side 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。7 f# _# _; }  G( t$ \5 F% ]
to determine the abnormal is heavy and light