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diff --git a/helm/software/lambda-delta/src/text/txtCrg.mli b/helm/software/lambda-delta/src/text/txtCrg.mli
new file mode 100644
index 000000000..150268a55
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+++ b/helm/software/lambda-delta/src/text/txtCrg.mli
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+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department, University of Bologna, Italy.                     
+    ||I||                                                                
+    ||T||  HELM is free software; you can redistribute it and/or         
+    ||A||  modify it under the terms of the GNU General Public License   
+    \   /  version 2 or (at your option) any later version.              
+     \ /   This software is distributed as is, NO WARRANTY.              
+      V_______________________________________________________________ *)
+
+type status
+
+val initial_status: unit -> status 
+
+val refresh_status: status -> status
+
+val crg_of_txt: (status -> 'a) -> (status -> Crg.entity -> 'a) ->
+                (Txt.command -> unit) -> status -> Txt.command -> 'a