21/20
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21/20 |-2 1 -1 1>
84.4672 cents
File:Jid 21 20 pluck adu dr220.mp3 sound sample
A small semitone of about 84.5 cents, 21/20 may be found in 7-limit just intonation as, for example, the difference between 8/7 and 6/5, or between 5/3 and 7/4.