public function removeLabel(CINLabel $label) {
        $remove = -1;
        $c = count($this->labels);
        for ($i = 0; $i < $c; $i++) {
            if ($this->labels[$i] === $label) {
                $remove = $i;
                break;
            }
        }

        if ($remove > -1) {
            array_splice($this->labels, $remove, 1);
        }
    }