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