+-----+      +-----+      +-----+      +-----+      +-----+
|     |  AB  |     |  BC  |     |  CD  |     |  DE  |     |
|  A  |----->|  B  |----->|  C  |----->|  D  |----->|  E  |
|     |      |     |      |     |      |     |      |     |
+-----+      +-----+      +-----+      +-----+      +-----+