What is the average age of students who have city code "NYC" and have secretary votes for the spring election cycle?
return students ;return #1 that have secretary votes for the  spring election cycle ;return city codes of #2 ;return #2 where #3 is NYC ;return ages of #4 ;return the  average of #5
['select', 'filter', 'project', 'comparative', 'project', 'aggregate']