What are the names of all cities with more than one airport and how many airports do they have?
return cities ;return airports of #1 ;return number of  #2 for each #1 ;return #1 where #3 is  more than  one ;return airports of #4 ;return number of  #5 for each #4 ;return names of #4 ;return #7 ,  #6
['select', 'project', 'group', 'comparative', 'project', 'group', 'project', 'union']