10. The computer system of claim 9 , wherein the first type is an alphabetic type, the second type is an alpha-numeric type, and the third type is a numeric type.
14. The computer system of claim 10 , wherein the first calculation comprises setting the similarity score for the token pair to a value of an edit distance between the two tokens, wherein the value of the edit distance is calculated by subtracting the length of the unmatched substrings between the two tokens from the length of the longer token, and dividing the result by the length of the longer token.