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