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