-1/9-7-9|-5-7-5-8-----------------5-6-5-8-9---------------------9-10-12-9-7---
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-5-15|-11-9-11-9-12-10-9-7-|-7-5-7-5-7-8|x2|-5-3-5-3-5-6-------|--12-13-15----
-----|---------------------|------------|--|-------------6-7-8b|--------------
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-16-17------------------------------------------------------------------------
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