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