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DUO 3.0: A Vocabulary Book You Run by Deciding 'Only 560 Sentences'
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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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If DUO 3.0 Feels Heavy, There's an Entrance Called DUO Select
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DUO Learns by Example Sentences, Kikutan Learns by Sound: Choose Your Vocabulary Book by Design
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Kikutan [Basic] 4000: Decide the Rotation Before You Buy
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Kin no Phrase, Expanded & Revised: Three Passes in Six Weeks, with Score-Band Ranges