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use Set::Scalar;
$s = Set::Scalar->new;
$s->insert('a', 'b');
$s->delete('b');
$t = Set::Scalar->new('x', 'y', $z);

    $u = $s->union($t);
    $i = $s->intersection($t);
...
    $e = $s->symmetric_difference($t);
    $v = $s->unique($t);
    $c = $s->complement;