12
8
+---+---+---+---+---+---+---+---+---+---+---+---+
|       |                       |   |       |   |
+---+   +   +---+---+   +---+   +   +   +   +   +
|       |   |           |       |       |       |
+   +---+   +---+---+---+---+---+   +---+---+---+
|   |       |                                   |
+   +   +   +   +---+---+---+---+---+---+---+   +
|   |   |   |       |       |                   |
+   +---+   +---+   +   +   +---+   +---+---+---+
|   |       |           |       |           |   |
+   +   +---+---+---+---+---+   +   +---+   +   +
|   |   |           |           |       |       |
+   +   +   +---+   +   +---+---+---+   +---+   +
|       |       |       |       |   |       |   |
+   +---+   +   +---+---+   +   +   +---+   +---+
|           |               |       |           |
+---+---+---+---+---+---+---+---+---+---+---+---+
