19
 comment:c
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C -0.5726640 -0.1903800 -0.6357740
C 1.2189020 -0.8573250 0.0860520
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C 2.1477101 1.2388170 -0.6676020
H 1.2224160 -1.9414620 -0.0232050
H 2.8638439 -0.6340140 -1.3521620
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H 1.0589240 -0.5570580 1.1228950
H 0.9550560 1.6150690 1.0845020
H 2.7602921 1.8119760 -1.3602660
H 1.0661290 2.9987819 -0.0363680
H -1.2874351 1.8180680 -0.1307080
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O -1.8380210 -2.0098469 0.2387770