________________________________________
          |                                      |
          |        RELATIONS                     |   EVERY OPERATION IS A FUNCTION,
          |    _____________________________     |   BUT A FUNCTION (SAY, CATALOG)
          |  |                              |    |   MAY FAIL TO BE AN OPERATION.
          |  |             FUNCTIONS        |    |
          |  |      _______________________ |    |   EVERY FUNCTION IS A RELATION,
          |  |      |                     | |    |   BUT A RELATION (SAY, FRIEND)
          |  |      |       OPERATIONS    | |    |   MAY FAIL TO BE A FUNCTION.
          |  |      |                     | |    |
          |  |      |_____________________| |    |
          |  |                              |    |
          |  |______________________________|    |
          |                                      |
          |______________________________________|

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