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回復第 1 帖由 MagicAndy 所發的帖子

44, find out which 4 have problem , (twice) and find out heavier or lighter
4 b# |1 |; P4 j* K: k- Y' a4 divide by 2

回復第 1 帖由 MagicAndy 所發的帖子

pls tell me the answer
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