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Proof step 102 from proof inv-mkdir (previous step)

⊦ ri-cons(ri, fs) → (ri-cons(ri0, fs0) ↔ (∀ key. (key ∈ ri → ri[key] ∈ fs ∧ key-cons(key, fs[ri[key]])) → key ∈ ri0 → ri0[key] ∈ fs0 ∧ key-cons(key, fs0[ri0[key]])))

A spec-lemma