Given a tab-delimited .txt file where data comes in pairs of lines, such as:

1    7    848773    75    A    74
1    7    848576    74    A    0
2    16    785802    75    A    0
2    16    786009    75    A    74
3    7    848576    75    A    74
3    7    848773    74    A    0

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I wish to tally the frequency of all unique number combinations - in the above example the desired output is:

7    848576    848773    2
16  785802    786009    1

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848773-848576 being the same as 848576-848773.

I'm not sure how to solve this problem. I'm accessing each pair of lines via: 
    my @F2 = split("\t", $_);
    my $partner = <$IN2>;
    my @F3 = split("\t", $partner);

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And then thought to use a multi-dimensional hash:

my %count;
$count{$F2[1]}{$F2[2]}{$F3[2]}++;

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However this would not handle equivalent pairs - which is the part i'm not sure how to do or how I would then print it out easily. What would be a good way to do it?

In reply to Tallying co-occurence of numbers by K_Edw

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