9-9, (01235678A): Quartal-9
Interval-content vector <676683>
Distance (12/9)*

the minimum Euclidean distance from this set to any transposition of the perfectly even 9 note chord, in semitones

Cohemitonic chromatic-cluster-containing
Hemitonic set contains one or more semitones
Quartal set can be generated by repeatedly stacking perfect fourths (5 semitones)
Symmetric the inverse of this set is the same set
Tritonic set contains one or more tritones