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77/64
|-6 0 0 1 1>
320.1438 cents
sound sample

77/64, the keenanismic minor third, arises in 11-limit JI scales as the interval between 8/7 and 11/8, and between 15/11 and 7/4. It is 385/384 (4.5 cents) sharper than 6/5. It is almost exactly 1/7th of a cent sharper than the 320 cent minor third of 15edo.