1||------------8-----------7-----------5-----------3------------
2||---------0-----------0-----------0-----------0---------------
3||------5-----------4-----------2-----------0------------------
4||---7-----------5-----------3-----------2---------------------

1 8--------7--------5--------3--------5--------7--------8--------7--------5--------3-----------3---
2 --------0--------0------------------0--------0-----------------0--------0-----------------0---------
3 -----0--------0--------0--------0--------0--------0--------0--------0--------0--------0----0------
4 7--------5--------3--------2--------3--------5--------7--------5--------3--------2---------------

1 8--------7--------5--------3--------5--------7--------8--------7--------5--------3-----------3-
2 --------0--------0------------------0--------0-----------------0--------0-----------------0---------
3 -----0--------0--------0--------0--------0--------0--------0--------0--------0--------0----0-----
4 7--------5--------3--------2--------3--------5--------7--------5--------3--------2-------------

I-10---10---12---12---13---10--12---8------8--
I---------------------------------------------------0----
I----0----0------0-----0-----0-----0---------0------
I-9----9-----10---10---12----9----10--7----------
I--------------------------------------------------------
I--------------------------------------------------------

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I-7-8-7-5-3-------3---------3-----------0--
I------------------0------0~1-------------1--
I----------------0------0-------------------0--
I-5-7-5-3-2--------------------3~2-0--2--
I--------------------------------------------3--
I--------------------------------------------x--