public function cache($qubaids, $whichtries, $questionid, $variantno, $subpartid) {
        foreach ($this->get_response_class_ids() as $responseclassid) {
            $analysisforclass = $this->get_response_class($responseclassid);
            $analysisforclass->cache($qubaids, $whichtries, $questionid, $variantno, $subpartid, $responseclassid);
        }
    }