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