% reply 0> use Set 1> my $s = Set->new(1 .. 4) $res[0] = bless( { '_items' => { '1' => 1, '2' => 1, '3' => 1, '4' => 1 } }, 'Set' ) 2> $s->has(5) $res[1] = '' 3> $s->has(3) $res[2] = 1