+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|     |     |     "     |     |     "     |     |     |
|  4 <<< 5 <<< 6  "  3 >>> 2 >>> 1  "  9 >>> 8 >>> 7  |
|  v  |     |  ^  "  ^  |     |     "     |     |  v  |
+--v--+-----+--^--+--^--+-----+-----+-----+-----+--v--+
|  v  |     |  ^  "  ^  |     |     "     |     |  v  |
|  3  |  9 >>> 7  "  8  |  5  |  4  "  2 >>> 1  |  6  |
|  v  |     |     "  ^  |     |     "  ^  |     |  v  |
+--v--+-----+-----+--^--+-----+-----+--^--+-----+--v--+
|  v  |     |     "  ^  |     |     "  ^  |     |  v  |
|  2  |  1  |  8  "  9  |  7  |  6  "  3 <<< 4 <<< 5  |
|  v  |     |     "     |     |     "     |     |     |
+==v==+=====+=====+=====+=====+=====+=====+=====+=====+
|  v  |     |     "     |     |     "     |     |     |
|  1  |  4  |  9  "  2  |  6  |  5  "  7  |  3  |  8  |
|     |     |     "     |     |     "     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|     |     |     "     |     |     "     |     |     |
|  8  |  6  |  3  "  4  |  9  |  7  "  5  |  2  |  1  |
|     |     |     "     |     |     "     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|     |     |     "     |     |     "     |     |     |
|  7  |  2  |  5  "  1  |  3  |  8  "  6  |  9  |  4  |
|     |  ^  |     "     |     |     "     |     |     |
+=====+==^==+=====+=====+=====+=====+=====+=====+=====+
|     |  ^  |     "     |     |     "     |     |     |
|  5  |  3  |  1  "  6  |  4  |  9 >>> 8 >>> 7  |  2  |
|     |  ^  |     "     |     |     "     |  v  |     |
+-----+--^--+-----+-----+-----+-----+-----+--v--+-----+
|     |  ^  |     "     |     |     "     |  v  |     |
|  9  |  7  |  4 <<< 5  |  8  |  2 >>> 1  |  6  |  3  |
|     |  ^  |     "  ^  |     |  ^  "     |  v  |     |
+-----+--^--+-----+--^--+-----+--^--+-----+--v--+-----+
|     |  ^  |     "  ^  |     |  ^  "     |  v  |     |
|  6  |  8  |  2  "  7  |  1  |  3 <<< 4 <<< 5  |  9  |
|     |     |     "     |     |     "     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+