my @diff;
my @inter

my %count2 = ();
foreach my $element (@union,@ICUNAV) 
{
$count2{$element}++;
};
foreach my $element (keys %count2) 
{
push @{ $count2{$element} > 1 ? \@inter : \@diff }, $element;
};
print Dumper(@diff),"\n";