-----------------------------------------------------
-----------------------------------------------------
----4----------6---------8------------4----6----6----
---4-4-4-x2---6-6-6x2---8-8-8x2------4----6----8-x2--
--2---4------4---6-----6---8--------2----4----6------
-4----------6---------8------------4----6----8-----


3--2--- 3-5-7----------------------------------------------
3--3-2--5-7-9----------------------------------------------
---2-2--5-7-9-x2--------------------------------------------
-----2--5-7-9-------------------------------------------
2-------3-5-7-------------------------------------------