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put 3 balls on each side,
6 ^- Z1 D/ e2 ]5 Itvb now,tvbnow,bttvbif balance, we can prove that all 6 balls on the 天平 is normal,
. M4 f( ~: X1 P; P3 Iif not balance, we can prove that the 6 balls outside the 天平 is normal.tvb now,tvbnow,bttvb" d" S/ T+ ?$ U
then use the proved-normal ball on one side and put the other ball on other side
/ o# Q  h- V& e; t5.39.217.76to determine the abnormal is heavy and light
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