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  1. or download this
    my @results = ( $col[0], $col[3] );
for my $dataset (@data) {
...
    )[0]->[2];
}
  2. or download this
    my @results = ( $col[0], $col[3] );
for my $dataset (@data) {
...

    push @results, $first->[2];
}
  3. or download this
    my @results = ( $col[0], $col[3] );
for my $dataset (@data) {
...

    push @results, $beef[0]->[2];
}