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  1. or download this
    $ perl -MData::Dumper -E'
        $Data::Dumper::Useqq = 1;
    ...
        say $h{$_} || 0;
    '
    1
    
  2. or download this
    $ perl -E'
        $Data::Dumper::Useqq = 1;
    ...
        say $h{$b} || 0;
    '
    0
    
  3. or download this
    $ perl -MUnicode::Normalize=NFC -E'
        $Data::Dumper::Useqq = 1;
    ...
        say $h{$b} || 0;
    '
    1