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54-EDO is an equal temperament that divides the octave into 54 equal parts, each 22.2222 cents in size. It's a rare temperament which adds approximations of the 11th and 15th harmonics, as well as an alternate (flat) mapping for the 5th, to 27edo which it doubles. The 54cd val makes for an excellent tuning of 7-limit hexe temperament.