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