13. A computer-implemented method, comprising: identifying, by a processor, in a document of a plurality of documents, one or more textual sequences; identifying, by the processor, based on the one or more textual sequences, a presence of novel content in the document where the novel content includes content that does not occur in other documents of the plurality of documents; assigning, by the processor, a score to the document based on the identified novel content including each of the one or more textual sequences; and ranking, by the processor, the document among the plurality of documents based on the assigned score.
13. A computer-implemented method, comprising: identifying, by a processor, in a document of a plurality of documents, one or more textual sequences; identifying, by the processor, based on the one or more textual sequences, a presence of novel content in the document where the novel content includes content that does not occur in other documents of the plurality of documents; assigning, by the processor, a score to the document based on the identified novel content including each of the one or more textual sequences; and ranking, by the processor, the document among the plurality of documents based on the assigned score. 19. The computer-implemented method of claim 13 , where the plurality of documents includes a cluster of news documents.