Which paper is published in an institution in "USA" and have "Turon" as its second author?
return papers ;return second authors of #1 ;return #1 where #2 is  Turon ;return institutions that  #1 are published in ;return #4 that  are in the  USA ;return #1 where #4 is  any  #5 ;return #1 in both #3 and #6
['select', 'project', 'comparative', 'project', 'filter', 'comparative', 'intersection']