Hi all!
I have a file like this :

colum a        colum b
uid = 1         uid = 4
uid = 2         uid = 3
uid = 3         uid = 2
uid = 4         uid = 1

I'm trying to find those columns with the same numbers regardless the colum
they are.  That's, in the example, the row 2 is identital to row 3.
So far, I have tried:

my %seen_pair;
        while (my $line = <IN> ){
        chomp $line;
        my ($col_1, $col_2) = split (/\t/,$line);
            if ($seen_pair{$col_1 }{$col_2} || $seen_pair{ $col_2 }{$col_1}
){
            print "Pair already seen: $col_1\t$col_2\n";
            next;
                    }
            }

But I thinks it's wrong.
Thank you in advance.
-- 
Jordi

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