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17 Phrase breaks There are two methods for predicting phrase breaks in Festival, one simple and one sophisticated. The first method is by CART tree. In this case a probabilistic model using probabilities of a break after a word based on the part of speech of the neighbouring words and the previous word. This is combined with a ngram model of the distribution of breaks and non-breaks using a Viterbi decoder to find the optimal phrasing of the utterance. However sometimes it does sound wrong, suggesting there is still further work required.