5. The method of claim 4 further comprising identifying seen and unseen clusters, the unseen clusters having a previously unoccurring sequence of words, wherein the classing function identifies unseen clusters by: employing the word based classification if the cluster has a previous occurrence, and employing the class based classification if the cluster is previously unseen.
4. The method of claim 2 further comprising a clustering, the clustering defining the number of words in sequence to which a prediction applies, the clustering being at least 3.