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