/**
* Get the number of times each variant has been used for each question in a list
* in a set of usages.
* @param array $questionids of question ids.
* @param qubaid_condition $qubaids ids of the usages to consider.
* @return array questionid => variant number => num uses.
*/
public static function load_used_variants(array $questionids, qubaid_condition $qubaids)
{
$dm = new question_engine_data_mapper();
return $dm->load_used_variants($questionids, $qubaids);
}
