initial Slavic grammar, shared between Bulgarian and Russian

next-lib/src/bulgarian/DiffBul.gf

@@ -0,0 +1,15 @@
+instance DiffBul of DiffSlavic = open CommonSlavic, Prelude in {
+
+  param
+    Case  = Acc | Dat ;
+
+    Species = Indef | Def ;
+
+    NForm = 
+        NF Number Species
+      | NFSgDefNom
+      | NFPlCount
+      | NFVocative
+      ;
+
+}