+-+-------+---+
| |       |   |
| + +---+ +-+ |
|   |   |   | |
| + | + +-+ + |
| | | | | |   |
| +-+-+ | +-+ |
| |    S|   | |
| | +-+ +-+ | |
| |   |     | |
| +-+ +---+ + |
|   |     |   |
| + +---+ +---+
| |     |     |
+-+---+ +-----+
