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