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