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Cassiodorus Cassiodorus, De artibus et disciplinis liberalium litterarum, p6, 39
7. Iastius est dorium hemitonio, hypolydium tono, hypoaeolium tono semis, hypophrygium ditono, hypoiastium duobus semis, hoc est diatessaron symphonia, hypodorium tribus tonis praecedens.

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