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