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    binmode(STDOUT, ':encoding(UTF-8)');

    binmode(STDOUT, ":utf8");

    open HASH, '<:encoding(UTF-8)', 'test_hash.txt';
    ...
    open INPUTFILE, '<:encoding(UTF-8)', 'test_input.txt';

    open HASH, '<:utf8', "test_hash.txt";
    ...
    open INPUTFILE, '<:utf8', "test_input.txt";

    my @word = $entry =~ /(\X)/g;

    my @word = $entry =~ /(\X+)/g;

    for my $letter (@letters) {
        my @input_features = @{ $hash{$letter} };
        print join(" ", @input_features) . "\n";
    }