Why is "there" pronounced あそこ and not just あこ?


> **Possible Duplicate:**  
>  [Irregularity of あ-series in
> demonstratives](https://japanese.stackexchange.com/questions/4815/irregularity-
> of-%e3%81%82-series-in-demonstratives)

Maybe this is a little hard to answer, but I'm curious why the typical
これ/それ/あれ pattern doesn't apply to ここ/そこ/あそこ. Is anyone familiar with any
etymological reasoning behind choosing あそこ as a reading over あこ?

