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DUO 3.0: A Vocabulary Book You Run by Deciding 'Only 560 Sentences'
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Which DUO 3.0 CD Should You Buy? Basic or Review — How to Assemble the Audio
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Turning DUO's 560 Sentences from 'Can Read' to 'Can Say': Rotating from the Third Pass On
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DUO Learns by Example Sentences, Kikutan Learns by Sound: Choose Your Vocabulary Book by Design