use strict;
use warnings;

my @arr1 = ("one","two","three","four","five");

my @arr2 = ("one","a","b","one","c","d","e","two","f","g","h","two","i","j","two");

my @arr3; my %hash;

for my $arr2 (@arr2){
	
	if (grep $arr2, @arr1){
		
		$hash{$arr2}++;
		
	}else{
		
		push (@arr3, $arr2);
		
	}
	
}

push (@arr3, keys %hash);

print "@arr3";

output:
-------
e a d two j c h one g b f i