( Taking notes:
                                     ( David is printing
                                     ( a document.
                                      ~~~~~~~~~~~
                                                  o
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        |   |   client                server           |* *|
         \_/      __                                    \_/
          |      / /   Discovery   +----------+          |
         /|\    /_/  <-----------> |  +----+  |         /|\
        / | \__/                   +--|    |--+        / | \
       /  |                           |____/          /  |  \
      /   |                                          /   |   \
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        David                                        Adversary