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    use strict;
use warnings;
...
    say "$line_number: $line";
    $line_number++;
}
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    use strict;
use warnings;
...
    say "$line_number: $line";
    $line_number++;
}
  3. or download this
    use strict;
use warnings;
...
    say "$line_number: $line";
    $line_number++;
}