14. The system of claim 13 , wherein each of the two nodes represents an n−1 length word history, and wherein the edge is labeled with a word that follows the n−1 length word history.
14. The system of claim 13 , wherein each of the two nodes represents an n−1 length word history, and wherein the edge is labeled with a word that follows the n−1 length word history. 15. The system of claim 14 , wherein a lower order-gram is used to connect the two nodes.