+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
               |     |        |     |        |
+--+--+--+--+  +  +--+  +--+  +  +  +  +--+  +
|     |        |     |  |     |  |        |  |
+  +  +  +--+--+--+  +  +  +--+--+--+  +--+  +
|  |  |  |        |     |  |  |     |  |     |
+  +  +  +--+--+  +--+--+  +  +  +  +  +  +--+
|  |  |  |                 |     |  |  |     |
+  +--+  +  +--+  +--+--+--+--+--+  +  +  +--+
|        |     |                 |  |  |     |
+--+--+  +--+  +--+--+--+  +  +--+  +  +--+  +
|        |  |  |        |  |        |     |  |
+  +--+--+  +  +  +--+  +  +--+--+--+--+--+  +
|  |     |  |     |     |     |        |     |
+  +  +  +  +--+--+  +--+--+  +--+--+  +  +--+
|  |  |              |        |        |  |  |
+  +  +--+  +--+--+--+--+  +  +  +  +--+  +  +
|  |  |     |     |        |     |  |        |
+  +  +  +--+  +--+  +--+--+--+--+--+  +  +  +
|  |  |     |  |     |        |     |  |  |  |
+  +  +--+  +  +  +--+  +--+  +  +  +  +  +--+
|  |     |  |  |     |  |  |     |     |     |
+  +--+  +  +  +--+  +  +  +--+--+--+--+--+  +
|  |     |     |  |     |              |  |  |
+  +  +--+--+--+  +--+--+  +--+--+--+  +  +  +
|  |  |           |     |     |     |        |
+  +  +--+--+  +--+  +  +--+  +  +  +--+  +--+
|  |        |     |  |     |  |  |        |  |
+  +--+--+  +--+  +  +--+  +--+  +--+  +--+  +
|                 |     |        |            
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
Solution[X]