5
5
+---+---+---+---+---+
|                   |
+---+---+   +   +   +
|   |   |   |   |   |
+   +   +---+---+   +
|               |   |
+   +---+   +   +   +
|       |   |   |   |
+   +---+   +   +   +
|   |       |       |
+---+---+---+---+---+
