What is the first name and GPA of every student that has a GPA lower than average?
return students ;return GPA  of  #1 ;return average of  #2 ;return #1 where #2 is  lower than #3 ;return first names of  #4 ;return GPA  of  #4 ;return #5 ,  #6
['select', 'project', 'aggregate', 'comparative', 'project', 'project', 'union']