(* Properties on sn parallel unfold on local environments *******************)
-(* Note: this can also be proved like ltpr_ltpss_dx_conf *)
+(* Note: this can also be proved like ltpr_ltpss_dx_conf *)
lemma ltpr_ltpss_sn_conf: ∀L1,K1,d,e. L1 ⊢ ▶* [d, e] K1 → ∀L2. L1 ➡ L2 →
∃∃K2. L2 ⊢ ▶* [d, e] K2 & K1 ➡ K2.
#L1 #K1 #d #e #H