| ∀ adr. adr ∈ log0 → adr ∈ fs ∧ node-cons(fs[adr].key, fs[adr]), ∀ adr. adr ∈ log1 → adr ∈ fs ∧ node-cons(fs[adr].key, fs[adr]) ⊦ ∀ adr. adr ∈ log0 ∨ adr ∈ log1 → adr ∈ fs ∧ node-cons(fs[adr].key, fs[adr]) |
∀ adr. adr ∈ log1 → adr ∈ fs ∧ node-cons(fs[adr].key, fs[adr]), ∀ adr. adr ∈ log0 → adr ∈ fs ∧ node-cons(fs[adr].key, fs[adr]), adr ∈ log0 ∨ adr ∈ log1 ⊦ adr ∈ fs ∧ node-cons(fs[adr].key, fs[adr])