use Abh::SimpleSet;

$set1 = Abh::SimpleSet->new();
$set2 = Abh::SimpleSet->new();

$set1->add("a");
$set1->add("b");
$set1->add("c");
print "Set 1: " . $set1->to_string() . "\n";

$set2->add("d");
$set2->add("e");
$set2->add("f");
print "Set 2: " . $set2->to_string() . "\n";