+(* Basic properties *********************************************************)
+
+axiom item0_eq_dec: ∀I1,I2:item0. Decidable (I1 = I2).
+
+(* Basic_1: was: bind_dec *)
+axiom bind2_eq_dec: ∀I1,I2:bind2. Decidable (I1 = I2).
+
+(* Basic_1: was: flat_dec *)
+axiom flat2_eq_dec: ∀I1,I2:flat2. Decidable (I1 = I2).
+
+(* Basic_1: was: kind_dec *)
+axiom item2_eq_dec: ∀I1,I2:item2. Decidable (I1 = I2).
+
+(* Basic_1: removed theorems 21: