| (last ⊃ Post2(pm, s1, S) ∧ Post1(pm, s1, S);G2(pm, S, S') ∨ G1(pm, S, S')), I(pm, s1), Pre2(pm, s1), Pre1(pm, s1), I(pm, s0), RG-restr(pm, R1, G1, Pre1, Post1, I, R2, G2, Pre2, Post2), ¬ R2(pm, s0, s) ⊦ (last ⊃ Post1(pm, s1, S) ∧ Post2(pm, s1, S);G1(pm, S, S') ∨ G2(pm, S, S')) |