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Proof step 13 from proof fair-always-left-relyinv (previous step)

RG-restr(n2, R1, G1, Pre1, Post1, IV, R2, G2, Pre2, Post2), Pre1(n2, act, cs), Pre2(n2, act, cs), IV(n2, Act4, CS4), □ (R1(n2, Act4', CS4', Act4'', CS4'') ∧ R2(n2, Act4', CS4', Act4'', CS4'')), [:Act4, CS4 | [PL ◇ ¬ R1(n2, Act4', CS4', Act4'', CS4'') ∧ R1(n2, Act4', CS4', Act4'', CS4'') -+-> (last ⊃ Post1(n2, act, cs, Act4, CS4);G1(n2, Act4, CS4, Act4', CS4')) ] ∥ [PL R2(n2, Act4', CS4', Act4'', CS4'') -+-> (last ⊃ Post2(n2, act, cs, Act4, CS4);G2(n2, Act4, CS4, Act4', CS4'))] ] ⊦

A spec-lemma