---------------------------x4---
------------------------------
-999---------999--12-12--14-14
-999--77-99--999--12-12--14-14
-777--77-99--777--10-10--12-12
------55-77-------------------

then

----------------------x2------------------------------
----------------------------------------------------
----------------------------------------------------
--------------7-----------------------------------7-
-7-5-7-5-777-------7-5-7-5-777-------7-5-7-5-777----
--------------------------------7-------------------

-------------------------
-------------------------
-------------------------
-------------------------
-------7-5-7-5-7---------
-------------------55--77

Enjoy!