2 x
I--7-------------------------------------------------------7----------------------
I---10-8-7-------8-7-----------------------10-10------7-10----10------------------
I----------9---9-----9-7-9--------------------------------------------------------
I--------------------------9-7-9-----------------10----------------10-10----------
I---------------------------------------------------------------------------------
I---------------------------------------------------------------------------------
I---------------------------------------------------------------------------------
I------8-7------------------------------------------------------------------------
I----9-----9h11p9-9-7-9--7-9------------------------------------------------------
I---------------------------------------------------------------------------------
I---------------------------------------------------------------------------------
I---------------------------------------------------------------------------------