254
255
0
1
2

65534
65535
0
1
2

-2
-1
0
1
2

-2
-1
0
1
2

   0                0
   1                1
   2                2
 254               -2
 255               -1
     0                0
     1                1
     2                2
 65534               -2
 65535               -1
        0                0
        1                1
        2                2
       -2               -2
       -1               -1
                0                0
                1                1
                2                2
               -2               -2
               -1               -1