[------------------------------------
------------------------------------ } repeat several times
------------------------------------
---2-2222^3(0)^333-5(0)--3----------
--------------------------------------------------------------------
--7-7-7-8-10-8-7----------------------------------------------------
-----------------6-6-7-8-7-6----------------------------------------
-----------------------------4-4-5-7-5-4----------------------------
-----------------------------------------4-5-7-5--------------------
--------------------------------------------------------------------
--------------------------------------------
--------------------------------------------
--------------------------------------------
--4--4--4--4--^--5--5--5--5---7--5----------
--4--4--4--4--^--5--5--5--5---7--5----------
--2--2--2--2--^--3--3--3--3---5--3----------]