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  1. or download this
    my $result = '';
    for(my $i = 0; $i < $n; $i++) {
        $result .= "$i cat\n\man\n";
    }
    
  2. or download this
    my @lines;
    for(my $i = 0; $i < $n; $i++) {
    ...
    }
    #print Dumper(\@lines);
    my $result = join("\n", @lines);