What is the total access count of documents that are of the most common document type?
return document types ;return documents of #1 ;return number of  #2 for each #1 ;return #1 where #3 is  highest ;return documents of #4 ;return access counts of #5 ;return sum of #6
['select', 'project', 'group', 'superlative', 'project', 'project', 'aggregate']