as OrderManager::itemSetCompare() compares item set in lexicographical order, the items in each subset should be sorted to avoid duplicated item sets, so the original item set is sorted in OrderManager::_judgeFrequentItemset().
as OrderManager::itemSetCompare() compares item set in lexicographical order,
the items in each subset should be sorted to avoid duplicated item sets,
so the original item set is sorted in OrderManager::_judgeFrequentItemset().

izenecloud/sf1r-ad-delivery,pombredanne/sf1r-lite,izenecloud/sf1r-ad-delivery,izenecloud/sf1r-lite,izenecloud/sf1r-ad-delivery,izenecloud/sf1r-lite,izenecloud/sf1r-lite,izenecloud/sf1r-lite,izenecloud/sf1r-ad-delivery,pombredanne/sf1r-lite,izenecloud/sf1r-lite,izenecloud/sf1r-ad-delivery,pombredanne/sf1r-lite,pombredanne/sf1r-lite,pombredanne/sf1r-lite