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Proof step 382 from proof refine-link (previous step)

⊦ pre-link(p, p', ESUCCESS, user, root, fs, ofh) ↔ p ∈ root ∧ ¬ root[p].dir? ∧ ¬ p' ∈ root ∧ parent(p') ∈ root ∧ root[parent(p')].dir? ∧ px(user, parent(p), root, fs) ∧ py(user, parent(p'), root, fs)

A spec-lemma