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