clarification from #22 (comment)

bophono/PhonStateKVP.py

@@ -60,18 +60,6 @@ def combineWith(self, nextroot, nextend):
             self.phon += ""
         elif nextrootconsonant.startswith("dz") and self.position > 1:
             self.phon += "z"
-        elif nextrootconsonant.startswith("tdr"):
-            # Here the KVP rules have the rather puzzling convention to have different rules
-            # for syllables that have the exact same phonology in Tibetan. It has:
-            # བྲ -> always dra
-            # དྲ -> dra in second position, tra in first position
-            # which doesn't make sense as Tibetans make no difference between བྲ and དྲ.
-            # We thus have to artificially differentiate them at the phonological level recorded in roots.csv
-            # By having "tdra" for དྲ.
-            if self.position == 1:
-                self.phon += "tr"
-            else:
-                self.phon += "dr"
         else:
             self.phon += nextrootconsonant
         # decompose multi-syllable ends:

bophono/data/roots.csv

@@ -31,7 +31,7 @@
 འཁྲ,~thr+,[']tr+,tr,tr
 ག,kh-,k,g,g
 གྱ,khy-,c,gy,gy
-གྲ,thr-,tr,tdr,tr
+གྲ,thr-,tr,dr,tr
 གླ,l+,l,l,l
 དག*,k-,[r]g,g,g
 དགྱ,ky-,[r]j,gy,gy