Preliminary results Qian Liu, Qiuye Zhao

Base groups vs. modifier groups quality price post location info action null drugselectronicslocalmedicalnon-localsoftwaresubscriptiontravel service

Base groups vs. modifier groups quality price post location info action null drugselectronicslocalmedicalnon-localsoftwaresubscriptiontravel service

Base groups vs. price modifier sub-groups expensive sale affordable bargain special budget deal discount free cheap null drugselectronicslocalmedicalnon-localsoftwaresubscriptiontravel service

Base groups vs. location modifier sub-groups pacific mountain central eastern null drugselectronicslocalmedicalnon-localsoftwaresubscriptiontravel service