19. The article of manufacture according to claim 18 , wherein the selecting for said set of documents a plurality of the documents of the sub-group of documents further includes adding to said set of documents one or more additional documents from said sub-group of documents until each of the premises is included in at least one of the documents of said set of documents.
18. The article of manufacture according to claim 17 , wherein the selecting for said set of documents a plurality of the documents of the sub-group of documents further includes, after selecting said first document for said set of documents, adding to said set of documents a second document of said sub-group of documents that, of the documents of said sub-group of documents, has the next most of the premises after said first document.