--------------------------------------------------------
--------------------------------------------------------
--6-6---6-8-8---8-9-9--9-9-6--9-6-4--2-1----------------
--------------------------------------------------------
--------------------------------------------------------
--------------------------------------------------------
--------------------------------------------------------
--------------------------------------------------------
--6-6---6-8-8---8-9-9--9-9-6--9-6-4--2-1----------------
--------------------------------------------------------
--------------------------------------------------------
--------------------------------------------------------
--------------------------------------------------------
--------------------------------------------------------
--6-6---6-8-6---8-9-9--9-9-9-11-9-11-12^----------------
--------------------------------------------------------
--------------------------------------------------------
--------------------------------------------------------