+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|     |     |     |     "     |     |     |     "     |
|     |     |     |     "  4  |     |     |     "  3  |
|     |     |     |     "     |     |     |     "     |
+-----+-----+-----+-----+-----+-----+-----+-----+=====+
|     |     |     |     "     |     |     |     |     |
|     |  2  |     |  5  "     |     |     |  7  |  3  |
|     |     |     |     "     |     |     |     |     |
+=====+=====+=====+=====+=====+=====+=====+=====+=====+
|     |     |     |     "     |     |     |     "     |
|     |     |     |  4  "     |     |  6  |     "  8  |
|     |     |     |     "     |     |     |     "     |
+-----+-----+-----+-----+-----+-----+-----+-----+=====+
|     |     |     |     "     |     |     |     |     |
|     |  7  |  6  |     "     |  5  |     |     |  4  |
|     |     |     |     "     |     |     |     |     |
+=====+=====+=====+=====+=====+=====+=====+=====+=====+
|     |     |     |     "     |     |     |     |     |
|  1  |     |     |     "     |     |     |     |  8  |
|     |     |     |     "     |     |     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+=====+
|     |     |     |     "     |     |     |     "     |
|     |     |     |  6  "     |     |  5  |  2  "  4  |
|     |     |     |     "     |     |     |     "     |
+=====+=====+=====+=====+=====+=====+=====+=====+=====+
|     |     |     |     "     |     |     |     |     |
|     |     |  3  |     "     |  7  |     |     |  4  |
|     |     |     |     "     |     |     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+=====+
|     |     |     |     "     |     |     |     "     |
|     |  8  |     |     "     |  6  |     |  9  "  1  |
|     |     |     |     "     |     |     |     "     |
+=====+=====+=====+=====+=====+=====+=====+=====+=====+
|     |     |     |     |     |     |     |     |     |
| -   | -   | -   | -   | -   | -   | -   | -   | -   |
|     |     |     |     |     |     |     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+