23. A device configured to: segment a word into a string of consecutive phonemes; generate sequences of phonemes having at least one omitted phoneme; and associate a first set of multiple ones of the sequences of the phonemes with a first pronunciation level for the word, the first set of the sequences of the phonemes being associated with mispronunciations of the word for the first pronunciation level; associate a second set of multiple ones of the sequences of the phonemes with a second pronunciation level for the word, the second set of the sequences of the phonemes being associated with mispronunciations of the word for the second pronunciation level and being different from the first set of sequences of phonemes associated with the first level.
25. The device of claim 23 wherein the sequences of phonemes includes a complete sequence of phonemes for the word.