4.4BSD/usr/src/contrib/mh-6.8/papers/realwork/diagram3.tex

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% diagram 3

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