+-----+      +-----+      +-----+      +-----+
|     |      |     |      |     |      |     |
|  A  +<-----+  B  +<-----+  D  +<-----+  E  |
|     |      |     |      |     |      |     |
+--+--+      +-----+      +--+--+      +-----+
   ^                         |
   |               +-----+   |
   |               |     |   |
   +---------------+  C  +<--+
                   |     |
                   +-----+