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<DIV><FONT face="Times New Roman">Hidatsa /ts/ corresponds to Crow /t/ before /a/, and to /ch/ (that's the practical orthography) before a non-low vowel. So from a historical standpoint, I guess we can say that PSi *t becomes s and *s becomes t.</FONT></DIV>
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<DIV><FONT face="Times New Roman">Randy</FONT></DIV></BODY></HTML>