+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
               |                 |  |        |
+  +  +--+--+  +--+  +  +--+--+  +  +  +--+  +
|  |  |        |     |  |        |     |     |
+  +  +  +--+--+  +--+--+  +--+--+  +--+  +--+
|  |  |     |     |     |           |  |  |  |
+  +--+--+  +  +--+--+  +--+--+--+--+  +  +  +
|     |     |  |        |           |     |  |
+--+  +  +--+  +  +--+--+--+--+  +  +--+--+  +
|     |  |     |  |              |  |     |  |
+  +--+  +  +--+  +  +--+--+--+--+  +--+  +  +
|     |     |     |        |     |     |  |  |
+  +  +--+--+  +--+--+--+  +  +--+--+  +  +  +
|  |        |  |        |  |  |        |     |
+--+--+--+  +  +  +--+  +  +  +  +--+--+  +  +
|        |  |     |     |  |     |        |  |
+  +--+--+  +--+  +  +--+  +--+--+  +--+--+  +
|  |              |     |     |     |  |     |
+  +  +--+  +--+--+--+  +--+  +  +--+  +  +--+
|     |        |     |  |  |  |        |     |
+--+--+  +--+  +--+  +  +  +  +  +--+--+--+  +
|     |     |     |  |     |  |  |           |
+  +  +--+  +--+  +  +--+--+  +  +  +--+--+--+
|  |     |  |     |     |     |  |  |        |
+  +--+  +  +  +--+--+  +--+  +  +  +--+  +  +
|     |  |  |     |     |     |  |     |  |  |
+--+  +--+  +--+  +  +  +  +--+  +--+  +  +  +
|  |     |     |  |  |     |     |     |  |  |
+  +--+  +--+  +  +  +--+--+  +--+  +--+  +  +
|              |              |           |   
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+