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Proof step 16 from proof no-progress-left (previous step)

RG-restr(pm, R1, G1, Pre1, Post1, I, R2, G2, Pre2, Post2), Pre2(pm, s1), I(pm, s0), □ (R1(pm, S', S'') ∧ R2(pm, S', S'')), [:S | [PL S = s] ∥ [PL R2(pm, S', S'') -+-> (last ⊃ Post2(pm, s1, S);G2(pm, S, S'))]], ¬ R1(pm, s0, s), R1(pm, s0, S) ⊦

A spec-lemma