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  1. or download this
    for my $dat1 (@data1) {
        for my $dat2 (@data2) {
    ...
            open my $fh, '<', $filename or die "a horrible death $!";
        }
    }
    
  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,