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• 17:56, 14 March 2026 Inthar talk contribs created page Ternary parallelogram scales are MOS substitution (Created page with "This article proves the following theorem: ''Primitive ternary parallelogram scale words are MOS substitution scale words.'' == Definitions == === Pitch-class group === The ''pitch-class group'' of a scale word ''w'' in letters {{nowrap|'''x'''₁, ..., '''x'''_''r''}} with step signature {{nowrap|'''s''' ∈ ℤ^''r''{{angbr|'''x'''₁, ..., '''x'''_''r''}}}} is the abelian group {{nowrap|C(''w'') :{{=}} ℤ<sup>'...")