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The four two-code-point sequences in Big5 are Unicode Named Sequences whose names could be added to the Encoding Standard. From <http://www.unicode.org/Public/UNIDATA/NamedSequences.txt>: LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND MACRON;00CA 0304 LATIN SMALL LETTER E WITH CIRCUMFLEX AND MACRON;00EA 0304 LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND CARON;00CA 030C LATIN SMALL LETTER E WITH CIRCUMFLEX AND CARON;00EA 030C
Cool! https://github.com/whatwg/encoding/commit/95cb3f6276a779bef5b9ed0ec4d63fbafb5eaba0