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  1. or download this
    perl -MO=Deparse -e ' $a = "foo"; $b = ''foo''; $c = q{foo}'  
    $a = 'foo';
    $b = 'foo';
    $c = 'foo';
    
  2. or download this
    perl -MO=Deparse -e ' $a = "$foo"; $b = q{$foo};'  
    $a = "$foo";
    $b = '$foo';