10 5
   0 0 0 0 - 0 0 0 0
     0 0 0 0 0 - 0 0
       0 0 0 - 0 0 0
         0 0 0 0 - 0
           0 0 0 0 -
             0 - 0 -
               - - 0
                 0 0
                   -
                    
