14. The computer-readable storage medium of claim 13 , wherein the method further comprises calculating passage similarities by comparing the fingerprints of the second set of passages with the fingerprints of the first set of passages.
14. The computer-readable storage medium of claim 13 , wherein the method further comprises calculating passage similarities by comparing the fingerprints of the second set of passages with the fingerprints of the first set of passages. 15. The computer-readable storage medium of claim 14 , wherein the method further comprises determining emission probabilities for the HMM based on the calculated passage similarities.