21

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C 2.20439 -0.46951 -0.34667
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C 5.11282 -1.24168 -1.12569
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H 0.37025 -0.79473 0.20888
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H 4.68310 0.77916 -0.58424
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H 6.19567 -1.09643 -1.02567
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H 6.16322 0.80624 -2.59612
H 4.70904 1.79126 -2.79845