----------------------------------------------------
----------------------------------------------------
--999---555-----------------------------------------
--999---555---555--777------------------------------  x6
--777---333---555--777------------------------------
--------------333--555------------------------------

----------------------------------------------------
----------------------------------------------------
--999xxx555xxx--------------------------------------   x4
--999xxx555xxx555--777------------------------------  
--777xxx333xxx555--777------------------------------
--------------333--555------------------------------

---7----3-------------------------------------------
------------5---3-----5----0------------------------
----------------------------------------------------
----------------------------------------------------   x4
----------------------------------------------------
----------------------------------------------------