21

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C 2.44560 0.09126 -0.04086
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C 2.98977 1.13416 -1.03361
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H 4.07163 -1.33324 -0.20538
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H 1.65209 -1.83947 -2.00898
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H 2.96174 -0.90876 -3.84290
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