In which city do the most employees live and how many of them live there?
return cities ;return employees that  live  in #1 ;return number of  #2 for each  #1 ;return #1 where  #3 is highest ;return employees that  live  in #4 ;return number of  #5
['select', 'project', 'group', 'superlative', 'project', 'aggregate']