What are the student IDs and middle names of the students enrolled in at most two courses?
return students ;return courses #1 are  enrolled in ;return number of  #2 for each  #1 ;return #1 where #3 is  at most two ;return student IDs of  #4 ;return middle names of  #4 ;return #5 ,  #6
['select', 'project', 'group', 'comparative', 'project', 'project', 'union']