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2Â¥: Originally posted by marson at 2013-12-02 18:14:18
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3Â¥: Originally posted by zhangmt at 2013-12-03 09:17:28
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3Â¥: Originally posted by zhangmt at 2013-12-03 09:17:28
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Atom number 1, atomic number 8: [16]                                            

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