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diff --git a/matita/matita/contribs/lambdadelta/ground_2/lib/list.ma b/matita/matita/contribs/lambdadelta/ground_2/lib/list.ma
index d21e1b52b..9355f9c56 100644
--- a/matita/matita/contribs/lambdadelta/ground_2/lib/list.ma
+++ b/matita/matita/contribs/lambdadelta/ground_2/lib/list.ma
@@ -12,10 +12,9 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "ground_2/notation/constructors/nil_1.ma".
-include "ground_2/notation/constructors/nil_2.ma".
+include "ground_2/notation/constructors/nil_0.ma".
+include "ground_2/notation/constructors/cons_2.ma".
 include "ground_2/notation/constructors/cons_3.ma".
-include "ground_2/notation/constructors/cons_5.ma".
 include "ground_2/notation/functions/append_2.ma".
 include "ground_2/lib/arith.ma".
 
@@ -25,9 +24,9 @@ inductive list (A:Type[0]) : Type[0] :=
   | nil : list A
   | cons: A → list A → list A.
 
-interpretation "nil (list)" 'Nil A = (nil A).
+interpretation "nil (list)" 'Nil = (nil ?).
 
-interpretation "cons (list)" 'Cons A hd tl = (cons A hd tl).
+interpretation "cons (list)" 'Cons hd tl = (cons ? hd tl).
 
 let rec all A (R:predicate A) (l:list A) on l ≝
   match l with
@@ -39,9 +38,9 @@ inductive list2 (A1,A2:Type[0]) : Type[0] :=
   | nil2 : list2 A1 A2
   | cons2: A1 → A2 → list2 A1 A2 → list2 A1 A2.
 
-interpretation "nil (list of pairs)" 'Nil A1 A2 = (nil2 A1 A2).
+interpretation "nil (list of pairs)" 'Nil = (nil2 ? ?).
 
-interpretation "cons (list of pairs)" 'Cons A1 A2 hd1 hd2 tl = (cons2 A1 A2 hd1 hd2 tl).
+interpretation "cons (list of pairs)" 'Cons hd1 hd2 tl = (cons2 ? ? hd1 hd2 tl).
 
 let rec append2 (A1,A2:Type[0]) (l1,l2:list2 A1 A2) on l1 ≝ match l1 with
 [ nil2           ⇒ l2