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• 00:30, 21 October 2026 CompactStar talk contribs created page 2.5 subgroup (Created page with "The '''2.5 subgroup''' is just intonation subgroup consisting of rational intervals where 2 and 5 are the only allowable prime factors, so that every such interval may be written as a ratio of integers which are products of 2 and 5. This is an infinite set. Some examples of intervals in this subgroup are 5/4, 8/5, 25/16, 32/25, and so on. {{stub}}")