3. The method according to claim 2 , 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.
3. The method according to claim 2 , 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. 4. The method according to claim 3 , 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.