A slight improvement... 
sub intersection {
    my $n = scalar @_;
    my %count;
    foreach my $list (@_) {
        my %elements = map { $_ => 1 } @$list;
        $count{$_}++ foreach keys %elements;
    }
    return [ grep { $count{$_} == $n } keys %count ];
}

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In reply to Re^2: intersection of N arrays by nkuitse
in thread intersection of N arrays by basscakes

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