Masculine stems ending in -an (paradigm attan-, self):

  Sg. Pl.
Nom. atta attano
Acc. attanaj/attaj attano
Gen. attano attanaj
Dat. attano attanaj
Ins. attana/attena attanehi/attanebhi
Abl. attana attanehi/attanebhi
Loc. attani attanesu
Voc. atta/atta attano