diff --git a/lib/src/experimental/RGLBaseBul.gf b/lib/src/experimental/RGLBaseBul.gf
new file mode 100644
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+++ b/lib/src/experimental/RGLBaseBul.gf
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+concrete RGLBaseBul of RGLBase = 
+
+-- modules in Grammar, excluding Structural, Verb, Sentence, Question
+  TenseX - [CAdv,IAdv,TTAnt],
+  NounBul - [PPartNP],               -- to be generalized
+  AdjectiveBul,
+  NumeralBul,
+  ConjunctionBul,
+  AdverbBul,
+  PhraseBul,
+----  Sentence,
+  QuestionBul - [QuestCl,QuestVP,QuestSlash,QuestIAdv,QuestIComp],
+  RelativeBul - [RelCl,RelVP,RelSlash],
+----  Idiom [NP, VP, Cl, Tense, ProgrVP, ExistNP, SelfAdvVP, SelfAdVVP, SelfNP], ---- why only these?
+
+  SymbolBul [PN, Symb, String, CN, Card, NP, MkSymb, SymbPN, CNNumNP] ;          ---- why only these?
+
+----  Construction,
+----  Extensions,
+----  Documentation ;