List document id of documents status is done and document type is Paper and the document is shipped by shipping agent named USPS.
return documents ;return status of #1 ;return #1 where #2 is done ;return type of #1 ;return #3 where #4 is Paper ;return shipping agent that shipped #1 ;return #5 where #6 is named USPS ;return id of #7
['select', 'project', 'comparative', 'project', 'comparative', 'project', 'comparative', 'project']