12 10
+-+------+-+
| |      |D|
| +--- +-+ |
|      |   |
| -+ --+- -|
|  |   |   |
| -++-   --|
|-+ |   ---+
|S    |    |
+-----+----+
5 3
+---+
|S D|
+---+
9 10
+---+---+
|   |   |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
|D|   |S|
+-+---+-+
5 5
+---+
|S  |
+---+
|  D|
+---+
12 10
+-+------+-+
|        D |
|          |
|          |
|          |
|          |
|          |
|          | 
|S         |
+-----+----+
4 7
+-----+
|     |
|S|-|D|  
+-----+