#!/usr/bin/perl -s

our ($old);

use strict;
#undef $/;
#$/='';

my $pb     = qr{(?: ?_pb\d*_)};         ## page break mark
my $fn     = qr{(?:_fn\d*_)};           ## footnote mark

while(<>){

if($old){
 s/_sec\+O.*?:(.*?)_/\n/;
 s/_sec\+NA.*?:(.*?)_/\n$1/;
 s/_sec:(.*?)_/\n$1/;
}

 s/<\/?sync\b.*?>//g;
 s/_sec.*?:(.*?)_ ?//;
 s/$pb/ /g;
 s/$fn/ /g;
 s/_cp1252_//g;
 
 print;
}