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ABNF UTF8-xtra-char = UTF8-2 / UTF8-3 / UTF8-4 UTF8-2 = %xC2-DF UTF8-tail UTF8-3 = %xE0 %xA0-BF UTF8-tail / %xE1-EC 2(UTF8-tail) / %xED %x80-9F UTF8-tail / %xEE-EF 2(UTF8-tail) UTF8-4 = %xF0 %x90-BF 2(UTF8-tail) / %xF1-F7 3(UTF8-tail) UTF8-tail = %x80-BF angle-addr = [CFWS] "<" addr-spec [ alt-address ] ">" [CFWS] alt-address = alt-separator stct-addr / alt-separator "atomic" alt-separator = [FWS] "," [FWS] |