10. A computer implemented method comprising: segmenting, by a computer system, a word into a string of consecutive phonemes; generating, by the computer system, sequences of phonemes having at least one omitted phoneme; and associating 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; associating 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.
10. A computer implemented method comprising: segmenting, by a computer system, a word into a string of consecutive phonemes; generating, by the computer system, sequences of phonemes having at least one omitted phoneme; and associating 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; associating 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. 11. The method of claim 10 further comprising: associating a third set of multiple ones of the sequences of the phonemes with a third pronunciation level for the word, the third set of the sequences of the phonemes being associated with mispronunciations of the word for the third pronunciation level and being different from the first and second sets of sequences of phonemes associated with the first level and the second level; wherein the first pronunciation level comprises a loose pronunciation level, the second pronunciation level comprises a medium pronunciation level, and the third pronunciation level comprises a strict pronunciation level.