This looks like a "netstat" or NAT table.

If so, a simple hash may be a better structure to hold the information. You can transform the AOA into a hash while eliminating duplicates using this simple code:

my @AoA=([11,1],[22,2],[11,1],[44,4]); 
my %h;

 $h{$_->[0]} =
    $_->[1] for @AoA; 

print qq($_ -> $h{$_}\n) for sort keys %h

--Output---
11 -> 1
22 -> 2
44 -> 4
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