there is no augmented 2nd . there is only the 2nd,the sus2nd & the minor third, a sus. 2nd would be enharmonic with a (flated2nd.This way we can have a (sus2nd) & a (9th) of course the ninth comes after the seventh. The (sus2nd) is enharmonic with the (9th) only difference is the sus2 comes before the 7th is added. OR an octave appart :) I've been told that I'm wrong ,this maybe true. I made acouple of adjustments. the reason I belive this to be true is that I have seen chords with a (sus2) & chords with a (mi3). soi base my opinion on that . The sataement "there is no aug2" is proably too restrictive.