. <sub>.</sub><sub>.</sub><sub>.</sub> - - - C - - - A A
N N N N N N N N N N N N N C N N N A N A N C N N N N N<sup>2</sup> 6 A 2<sup>4</sup><sup>6</sup> A N A N A N A N A N C N N N C C A A N A A A N N 1<sup>1</sup> C N C C A C A N N N C C A N A C C N A
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