Whoops: Those ascii diagrams again:

      +---------------+
      |   +-------+   |
JACK ----->|-> A ->|---+
      |   |       |
      +-->|-> B ->|----------> JACK
          +-------+

          +-------+
          |       |
      +---|<- C <-|<--+
      |   |       |   |
      |   +-------+   |
      |               |
      |   +-------+   |
JACK ----->|-> A ->|---+
      |   |       |
      +-->|-> B ->|----------> JACK
          +-------+

(also available as an attachment)
       +---------------+
       |   +-------+   |
JACK ----->|-> A ->|---+
       |   |       |
       +-->|-> B ->|----------> JACK
           +-------+


           +-------+
           |       |
       +---|<- C <-|<--+
       |   |       |   |
       |   +-------+   |
       |               |
       |   +-------+   |
JACK ----->|-> A ->|---+
       |   |       |
       +-->|-> B ->|----------> JACK
           +-------+

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