Re^2: hash with both values and keys unique to each other

[perlkhan77]

This is how I was able to do it. But it might not be a generalized solution

$seen{$chr1}++;
    $seen{$chr2}++;
    if (($seen{$chr1}>1)||($seen{$chr2}>1)){
        next;
    }    
    else{
          $hash_chr{$chr1}=$chr2;
          }