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#!/usr/bin/perl
use warnings;
...
open my $out, '>', NFKD($letter) or die "Open: $!";
unlink NFKC($letter) or warn "Warn unlink: $!";
unlink NFKD($letter) or die "Unlink: $!";

linux
Warn unlink: No such file or directory at ./script.pl line 13.

darwin
Unlink: No such file or directory at ./script.pl line 14.