We need a terminal capable of handling combining marks. 
$ perl -CS -MUnicode::Normalize -E'say NFC("\xE9")'
é

$ perl -CS -MUnicode::Normalize -E'say NFD("\xE9")'
e

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In reply to Re^3: Trying to determine the output length of a Unicode string by ikegami
in thread Trying to determine the output length of a Unicode string by pierswalter

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