9. The method of claim 8 , wherein the step of smoothing comprises the step of additive smoothing.
10. The method of claim 9 , wherein the step of additive smoothing comprises the steps of: computing a smoothed probability ^P ij of an open bigram c i c j in the input sequence S 1 with the formula P ^ ij = p ^ ⁡ ( c i ⁢ c j | S 1 ) = X ij + α ∑ k = 1 M ⁢ ∑ l = 1 M ⁢ X kl + α ⁢ ⁢ U , where α is a parameter that controls intensity of the smoothing and U is a number of unique open bigrams that occur in at least one of the input sequence and the known sequence.