I'm not sure what sort of source data you're looking at, or what basis there is for saying things like "A101 matches B302" and so on. But if the four arrays actually have matching values, and you want to track the distribution of values across arrays, something like this might help: 
use strict;

# pretend these are our four arrays:
my @A = qw/we me you them us foo others folks/;
my @B = qw/them I we he she it one foo/;
my @C = qw/foo bar baz blah me he we she/;
my @D = qw/this that another foo bar baz/;

my %arefs = ( A => \@A, B => \@B, C => \@C, D => \@D );

my %distro;

for my $ary ( sort keys %arefs ) {
    my $aref = $arefs{$ary};
    for ( my $i=0; $i<@$aref; $i++ ) {
        my $elem = $$aref[$i];
        $distro{$elem} .= sprintf( " %s%3.3d ", $ary, $i );
    }
}

for my $elem ( sort keys %distro ) {
    print "$elem\t$distro{$elem}\n";
}

__OUTPUT__
I        B001 
another  D002 
bar      C001  D004 
baz      C002  D005 
blah     C003 
folks    A007 
foo      A005  B007  C000  D003 
he       B003  C005 
it       B005 
me       A001  C004 
one      B006 
others   A006 
she      B004  C007 
that     D001 
them     A003  B000 
this     D000 
us       A004 
we       A000  B002  C006 
you      A002

[download]
Now, you can either save the output to a file, and use other tools (or write other perl code) to do interesting things with the list, or just add some more steps in the above script, to grep for values of interest in the %distro hash -- e.g.: 
my @keylist = sort keys %distro;

my @hitAll4 = grep { $distro{$_} =~ /A\d+ B\d+ C\d+ D\d+/ } @keylist;

my @missingD = grep { $distro{$_} !~ / D\d+/ } @keylist;

# and so on.

[download]

(updated the print statement to use tabs for nicer alignment)

In reply to Re: confusing array comparison by graff
in thread confusing array comparison by Anonymous Monk

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