use strict;
use warnings;

@array1 = (c,d,e);
@array2 = (e,f,g,h);
@array3 = (a,b,d);
@array4 = (s,g,h,j,k,l)
my (%union, %intersect);
foreach my $e (@array1, @array2) {
    $union{$e}++ && $intersect{$e}++
}
my @intersect = sort keys %intersect;
print FILEOUT "@intersect\n"; #prints intersecting words
print FILEOUT scalar @intersect;