rfc2822 April 2001
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3.2.6. Miscellaneous tokens
Three additional tokens are defined, word and phrase for combinations
of atoms and/or quoted-strings, and unstructured for use in
unstructured header fields and in some places within structured
header fields.
word = atom / quoted-string
phrase = 1*word / obs-phrase
utext = NO-WS-CTL / ; Non white space controls
%d33-126 / ; The rest of US-ASCII
obs-utext
unstructured = *([FWS] utext) [FWS]
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