Qed.

(* Specifications: *)
Lemma trivial_inv_4 : lt_Ck Reset kg1.
Lemma trivial_inv_5 : lt_Ck Reset kg3.
Derive Inversion_clear cl_TRT_APPROACH with
(forall st1 st2 : S_Ck ST, TrT st1 Approach st2) Sort Prop.