!(me, O2, P)(H0), P0(H), rely(me, O1, H0 ∪ H, O2, H2), H0 ⊥ H ⊦ id = me, (r ∈ H0 → r ∈ H2) ∧ (r ∈ H0 → H0[r] = H2[r])