------------5-7-5--------------5-7-7------------5-7-5--
----7-7-7-7-7-----7---7-7-7-7-7---------7-7-7-7-7-----7
-------------------------------------------------------
-------------------------------------------------------


---------5-7-7--5-7-9-7-9-7-5-9--5-7-9-9-9-7-9-7-5-5---
7-7-7-7-7----------------------------------------------
-------------------------------------------------------
-------------------------------------------------------