6. The method of claim 1 , further comprising: identifying, by a processor of one of the one or more computing devices, one or more textual sequences in the particular document; and determining, by a processor of one of the one or more computing devices, an indication of importance, to the sequence of documents, of each of the one or more textual sequences.
6. The method of claim 1 , further comprising: identifying, by a processor of one of the one or more computing devices, one or more textual sequences in the particular document; and determining, by a processor of one of the one or more computing devices, an indication of importance, to the sequence of documents, of each of the one or more textual sequences. 7. The method of claim 6 , where determining the indication of importance, to the sequence of documents, of each of the one or more textual sequences is based on one or more of: a number of documents in the sequence of documents that contain the textual sequence, a sum of instances of the textual sequence for all of the documents in the sequence of documents, or a sum of an importance value over all pairs that involve the textual sequence.