How many students in the spring of 2016 were in the graduate or professional schools?
return the  graduate schools ;return the  professional schools ;return students of #1 ;return students of #2 ;return #3 in  the  spring of 2016 ;return #4 in  the  spring of 2016 ;return number of  #5 ;return number of  #6 ;return sum of #7 and  #8
['select', 'select', 'project', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']