What are the different affiliations, and what is the total enrollment of schools founded after 1850 for each enrollment type?
return enrollment  types ;return schools of #1 ;return #2 founded after 1850 ;return affiliations of #3 ;return different #4 ;return enrollments of #3 ;return sum of #6 for each #3 ;return #5 ,  #7
['select', 'project', 'filter', 'project', 'project', 'project', 'group', 'union']