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