18
 comment:c
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C 1.2043320 -1.1456100 -0.4313010
C 1.2261140 0.3068630 -0.3957930
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H 0.0735070 -1.5965070 1.3177630
H 0.1029290 0.5677930 1.3762820
H 1.7063000 0.8187980 -1.2296090
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H -0.4174590 2.7739730 0.9615250