What did Jiaozhi become the most divided in, prefectures, sub-prefectures or counties?
return Jiaozhi ;return prefectures of #1 ;return sub-prefectures of #1 ;return counties of #1 ;return number of  #2 ;return number of  #3 ;return number of  #4 ;return which is highest of #5 ,  #6 ,   #7
['select', 'project', 'project', 'project', 'aggregate', 'aggregate', 'aggregate', 'comparison']