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