P0(H1), P1(H0), P2(H0 ∪ H1), H1 ⊥ H0, ∀ H0. H0 ⊥ H1 ∧ P1(H0) → P2(H0 ∪ H1) ⊦ P2(H1 ∪ H0)
Used simplifier rules: ⊦ H0 ⊥ H1 → H1 ⊥ H0; (s)