#!/usr/bin/perl
#
use Data::Dumper;

my $datafile = "test.dat";
my %finalQ = ();

open(FH, "<$datafile") || die ;

my %combined = ();

while( <FH> ){
  chomp;
  my ($key,$value) = sort (split(/\t/,$_));
  $combined{$key}=$value;
}

my %count = ();
my %reverse = reverse(%combined);

foreach my $key (sort %combined) {
        print "$key => $combined{$key}\n";
        if ( exists $reverse{$key} ) {
                $count{"$key\t$reverse{$key}"}+=2;
                print "$key => $reverse{$key} :: match\n";
        } else {
                $count{"$key\t$combined{$key}"}++;
        }
}

print Dumper(%count);