Two retroflex series?

Dear folks,

I just received a question from a website reader and would
like to know if any of you know the answer. It goes like this:

>      I would like to add a series of retroflexes to the language. I was
> wondering if there are any natural languages that distinguish points of
> articulation between different sets of retroflexes, such as a series of
> retroflex stops with tounge reaching for top of hard-palate versus a series
> with toung reaching for soft-palate?
My idea is that the latter are fairly uncomfortable and probably
not contrastive enough, but am I right? I remember having read
somewhere that some natlang distinguishes two degrees of retroflexion
for *vowels*, do any of you know of that?


--Pablo Flores
  http://www.angelfire.com/scifi2/nyh/index.html
  Kudmibakomo           This silence makes
  Yetie wo yizut nuti   The stars more beautiful
  Arab umnuo jho        The teeth in your mouth

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