------------------0-------------------------------0--------------------------- --------1--------------1----------------1--------------1---------------------- ---0---------0--------------0-----0----------0--------------0-----0----------- -------------2--------------2----------------2--------------2----------------- --------3--------------3----------------3--------------3---------------------- ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ ---1----1----1----1----0----1----3----0--------------------------------------- -------------------------------------------0---------0----0------------------- --------2--------------0----2-------------------3----3------------------------ ---3--------------3--------------2--------------2----------------------------- ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ ---0---------3----0--------------0---------3----0----------------------------- --------0--------------0----0---------0--------------0----0------------------- --------3--------------3--------------3--------------3------------------------ ---2--------------2--------------2--------------2----------------------------- ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ ---0----0----0----0---------0----1---------1----1----------------------------- -----------------------2--------------0--------------------------------------- --------3-----------------------------2--------------------------------------- ---2--------------2--------------3--------------3----------------------------- ------------------------------------------------------------------------------