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#!/usr/bin/perl

...
    dp ("NF$_", normalize ($_, $u)) for qw( D C KD KC );
    say "";
    }

Bytes : PV("\341\270\257"\0)
UTF-8 : PV("\341\270\257"\0)       [UTF8 "\x{1e2f}"]        LATIN SMAL
+L LETTER I WITH DIAERESIS AND ACUTE
...
NFC   : PV("\341\270\257"\0)       [UTF8 "\x{1e2f}"]        LATIN SMAL
+L LETTER I WITH DIAERESIS AND ACUTE
NFKD  : PV("i\314\210\314\201"\0)  [UTF8 "i\x{308}\x{301}"] LATIN SMAL
+L LETTER I + COMBINING DIAERESIS + COMBINING ACUTE ACCENT
NFKC  : PV("\341\270\257"\0)       [UTF8 "\x{1e2f}"]        LATIN SMAL
+L LETTER I WITH DIAERESIS AND ACUTE