1,2,3
4,5,6
7,8,9

123 456 789
412 753 896

1,2,3,4
5,6,7,8
9,a,b,c
d,e,f,g

1234 5678 9abc defg
***			[0][0 ~ n-2] : [y][x+1]
   *			[0][n-1] : [y+1][x]
     *			[1 ~ n-2][0] : [y-1][x]
      **		[1 ~ n-2][1 ~ n-2] : [y][x]
        *		[1 ~ n-2][n-1] : [y+1][x]
          *		
           **           
             *          
               *        [n-1][0] : [y-1][x]
                ***     [n-1][1 ~ n-1] : [y][x-1]
5123 9674 dab8 efgc


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