Thirteen limit tetrads
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There are four 13-limit tetrads with smallest steps all larger than 11/10; these are the otonal chords 1-9/8-5/4-13/8 and 1-9/8-11/8-13/8 and their utonal counterparts 1-13/10-13/9-13/8 and 1-13/11-13/9-13/8, with respective steps of 9/8-10/9-13/10-16/13, 9/8-11/9-13/11-16/13, 13/10-10/9-9/8-16/13 and 13/11-11/9-9/8-16/13.