Small suggestion to reduce redundancy: 
for my $h (\%a1, \%a2) {
    print join ',', map{ exists $h->{ $_ } ? $_ : '##' } @a;
}

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Knitpicking is the only way to perfection.
--kap

In reply to Re^2: Perlish way of doing this by kappa
in thread Perlish way of doing this by mkirank

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