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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnh_drops.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnh_drops.ma
deleted file mode 100644
index d4927690f..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cnh_drops.ma
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-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||M||                                                             *)
-(*      ||A||       A project by Andrea Asperti                           *)
-(*      ||T||                                                             *)
-(*      ||I||       Developers:                                           *)
-(*      ||T||         The HELM team.                                      *)
-(*      ||A||         http://helm.cs.unibo.it                             *)
-(*      \   /                                                             *)
-(*       \ /        This file is distributed under the terms of the       *)
-(*        v         GNU General Public License Version 2                  *)
-(*                                                                        *)
-(**************************************************************************)
-
-include "static_2/relocation/lifts_theq.ma".
-include "basic_2/rt_transition/cpm_drops.ma".
-include "basic_2/rt_transition/cnh.ma".
-
-(* NORMAL TERMS FOR HEAD T-UNUNBOUND RT-TRANSITION **************************)
-
-(* Advanced properties ******************************************************)
-
-lemma cnh_atom_drops (h) (b) (G) (L):
-      ∀i. ⬇*[b,𝐔❴i❵] L ≘ ⋆ → ⦃G,L⦄ ⊢ ⥲[h] 𝐍⦃#i⦄.
-#h #b #G #L #i #Hi #n #X #H
-elim (cpm_inv_lref1_drops … H) -H * [ // || #m ] #K #V1 #V2 #HLK
-lapply (drops_gen b … HLK) -HLK #HLK
-lapply (drops_mono … Hi … HLK) -L #H destruct
-qed.
-
-lemma cnh_unit_drops (h) (I) (G) (L):
-      ∀K,i. ⬇*[i] L ≘ K.ⓤ{I} → ⦃G,L⦄ ⊢ ⥲[h] 𝐍⦃#i⦄.
-#h #I #G #L #K #i #HLK #n #X #H
-elim (cpm_inv_lref1_drops … H) -H * [ // || #m ] #Y #V1 #V2 #HLY
-lapply (drops_mono … HLK … HLY) -L #H destruct
-qed.
-
-(* Properties with generic relocation ***************************************)
-
-lemma cnh_lifts (h) (G): d_liftable1 … (cnh h G).
-#h #G #K #T #HT #b #f #L #HLK #U #HTU #n #U0 #H
-elim (cpm_inv_lifts_sn … H … HLK … HTU) -b -L #T0 #HTU0 #HT0
-lapply (HT … HT0) -G -K /2 width=6 by theq_lifts_bi/
-qed-.
-
-(* Inversion lemmas with generic relocation *********************************)
-
-lemma cnh_inv_lifts (h) (G): d_deliftable1 … (cnh h G).
-#h #G #L #U #HU #b #f #K #HLK #T #HTU #n #T0 #H
-elim (cpm_lifts_sn … H … HLK … HTU) -b -K #U0 #HTU0 #HU0
-lapply (HU … HU0) -G -L /2 width=6 by theq_inv_lifts_bi/
-qed-.