+------------------------+
                         |
  +---------------+-+    |
  |   K           |+|    |
  |      +--+     |+|    |
  +---+--+  |     |+|    |
      +     |     |+|    |
 +----+-----+   +-+ +-+  |
 |              |     |  |
 |   +----------+     |  |
 |              +-----+  |
 |                       |
 +-----------------------+