D               
    C       |               
    |  +----+---+           
    |  |    |   |  +-------+
A---+--+ E  |   |  |       |
    |    |  |   +--+--+    |
    +----+--+      |  |    |
         |     F---+  |    |
    G----+---H        B    |
         +-----------------+