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  1. or download this
    $_ = "hello";
    
    ...
    $_ = "aeiou";
    print "it has all the vowels\n" if (/a/i && /e/i && /i/i && /o/i && /u
    +/i);
    print "it still has all the vowels\n" if ($_ =~ /a/i && $_ =~ /e/i && 
    +$_ =~ /i/i && $_ =~ /o/i &&  $_ =~ /u/i);