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  1. or download this
    #!/usr/bin/perl
    use warnings;
    ...
        my $valid = $string =~ tr/"// % 2 ? 0 : 1;
        print "$valid: $string\n";
    }
    
  2. or download this
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
    }map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,