my $line = 4;

while (@lines > 3) {
    
    # check first 3 lines against the 4th line
    my @vals = split /\s+/, $lines[3];
    my @chk = split /\s+/, join(' ', @lines[0..2]);
    my %match;
    foreach my $val (@vals) {
        $match{$val}++ if grep { $val eq $_ } @chk;
    }
    my @match = sort keys %match;
    my @nomatch = grep { not exists $match{$_} } @vals;

    my $match = @match;
    my $nomatch = @nomatch;
   
# do whatever you want with the matches and no-matches    
    print MATCH "$line: \tmatch = @match\n";
    print NOMATCH "$line: \tnomatch = @nomatch\n";
    
    
    
    $line++;

    # get rid of first line so next loop will be 2-6 and so on
    shift @lines;
}