7 - 8 - A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X
message header
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... encoded-words from "text", "ctext", or "word"s,
according to the rules in section 4, anytime they
appear in appropriate places in message headers. It
must support both the "B" and "Q" encodings for any
...