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