diagram5.tex

早期freebsd实现

% diagram 5

\verbatim
To: <reply-to|from>
cc: <??to|cc><to>,<cc>
Fcc: +outbox
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Subject: <??subject>Re: <subject>
In-reply-to: <??date><??message-id>Your message of <date>.
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In-reply-to: <??date><!message-id>Your message of <date>.
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--------

                          \
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                          /   XX
                                X
                                  X
                                   X
                                   X
                                   X
                               IIIIIIIII
                               IIIIIIIII
                               IIIIIIIII
                               IIIIIIIII
                               XXXXXXXXX
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          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
         XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
         XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
         XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
           XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
            XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
              XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
               XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
                  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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                               XXXXXXXXX
?endverbatim