Did the male or female population have a higher literacy rate in 1991?
return the  male population ;return the  female population ;return literacy rates of #1 ;return literacy rates of #2 ;return #3 in  1991 ;return #4 in  1991 ;return which is higher of #5 ,  #6
['select', 'select', 'project', 'project', 'filter', 'filter', 'comparison']