5. The method of claim 1 , wherein determining the strengths of differences between characters comprises: selecting a repertoire of characters from the sets of characters in the information; determining a set of probing characters; testing the repertoire of characters based on the set of probing characters; and determining the strengths of differences between characters in the repertoire of characters based on the testing with the set of probing characters.
5. The method of claim 1 , wherein determining the strengths of differences between characters comprises: selecting a repertoire of characters from the sets of characters in the information; determining a set of probing characters; testing the repertoire of characters based on the set of probing characters; and determining the strengths of differences between characters in the repertoire of characters based on the testing with the set of probing characters. 7. The method of claim 5 , wherein determining the set of probing characters comprises determining at least one character that has a primary difference that is greater than or equal to all characters in the repertoire of characters.