28. The computer program product of claim 22 , the computer program product being further operable to cause the data processing apparatus to: generate, for each word in a list of words to be recognized, an acoustic word model, the generating comprising generating a grouping of subword units representing a pronunciation of the word to be recognized using the single pronunciation estimator.
28. The computer program product of claim 22 , the computer program product being further operable to cause the data processing apparatus to: generate, for each word in a list of words to be recognized, an acoustic word model, the generating comprising generating a grouping of subword units representing a pronunciation of the word to be recognized using the single pronunciation estimator. 32. The computer program product of claim 28 , wherein the grouping of subwords is a network, and the network represents two pronunciations of a word, the two pronunciations being representative of utterances of native speakers of two languages.