---0--------------2---------------------------
---3----2-3-2-----2---------------------------
---4--------------0---------------------------play 2x
---4--------------0---------------------------
---2--------------2---------------------------
---2--------------3---------------------------

--7-----------9-10--12--9-10---5--7-----------
----7---10------------------------------------
----------------------------------------------play 1x
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-7------------9-10-9-5-2-9-7------------------
---7---10-------------------------------------
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           then start with the middle again