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      Chords · Multiple notes struck simultaneously 
           Thirteenths · Chords constructed from the scale intervals 1, 3, 5, 7, 9, 11 & 13 
                Reference · Chords constructed from the scale intervals 1, 3, 5, 7, 9, 11 & 13 
                Chord Group I · Maj13, Dom13, min13, minb3 
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