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• 01:48, 9 March 2026 Inthar talk contribs created page 2.5.7 subgroup (Created page with "The '''2.5.7 subgroup''' (in color notation, '''yaza nowa''') is the subgroup of just intonation comprising the intervals reachable by stacking 2/1, 5/4, and 7/4, with the exclusion of 3/2 (adding which would result in the full 7-limit). Notable intervals include 5/4 (the pental major third), 7/4 itself (the septimal subminor seventh), 7/5 (the lesser septimal tritone), 10/7 (the greater septimal tritone), 28/25 (the septimal quasi-meantone)...")