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           init
        |
...
        |
        V
       end
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    +---+  cmd  +---+     +---+
| B |------>| W |---->| S |
...
              |       +---+
               ------>| F |
                      +---+
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    +---+  DATA  +---+
| B |------->| W |
...
+---+  data  +---+     -->+---+
|   |------->| W |        | F |
+---+        +---+------->+---+