Dear Dhamma friends,
i have a comment on the term a.t.thahaakaarehi. It has become an old topic - you all have stopped discussing about it. hope it helps.
A.t.thahaakaarehi is a compound term in third case, made by dropping the case of the first word: a.t.tha + hi + aakaara + hi. Modern grammarians consider 'ehi' as an instrumental case. According to kaccaayana, the case ending is not ehi, but hi. The commentary on sa.yutta nikaaya, Mahaavagga .tikaa says a.t.thahaakaarehi means a.t.thahi kaara.nehi.
If the term is a.t.thaakaara, then it is a case of sandhi word: a.t.t.ha + aakaara