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