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A CALL (computer-aided language learning) system was developed to teach the pronunciation of Japanese tokushuhaku (long vowels, [he mora nasal and mora obstruents) to beginning-level learners whose native language is American English. Nonnatives often produce tokushuhaku with incorrect phone duration or quality. The proposed system (a) detects mistakes in phone duration and quality,~) returns an intelligibility score that tells the learner the likeli