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