What is maximum and minimum RAM size of phone produced by company named "Nokia Corporation"?
return phones ;return companies #1 are  produced by ;return #1 where #2 is  Nokia Corporation ;return RAM size of  #3 ;return maximum of  #4 ;return minimum of  #4 ;return #5 ,  #6
['select', 'project', 'comparative', 'project', 'aggregate', 'aggregate', 'union']