catawba phonems /r/, /d/, and /n/

[Ogalala2 at aol.com]

/r/, /d/, and /n/ are normally considered three seperate phonemes in Catawba.
 I have reasons to believe that there may be only one phoneme, namely /r/
and, consequetly, that [d] and [n] are merely allophones of /r/ as is the
case with Mandan and Crow/Hidatsa.  I would greatly appreciate any Catawba
scholar's (Shea,  Voorhis, others?) opinion on this matter.