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Proof step 6 from proof rg2-not-pre2-unfair (previous step)

(last ⊃ Post2(pm, s, S) ∧ Post1(pm, s, S);G2(pm, S, S') ∨ G1(pm, S, S')), I(pm, s), Pre1(pm, s), RG-restr(pm, R1, G1, Pre1, Post1, I, R2, G2, Pre2, Post2) ⊦ (last ⊃ Post1(pm, s, S) ∧ Post2(pm, s, S);G1(pm, S, S') ∨ G2(pm, S, S'))

User applied rule case distinction

And closed the goal!

Rule argument

pos: right 1

Proof step 6 from proof rg2-not-pre2-unfair (previous step)

User applied rule case distinction

And closed the goal!

Rule argument

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