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my( $fh, $start, $end, $n ) = @_; // $n is this process' sequence numb
+er 
...
    }
    ## write out modifed line. (see below)
}

my( $fh, $start, $end, $n ) = @_; // $n is this process' sequence numb
+er 

...
    }
    ## write out modifed line. (see below)
}