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