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Proof step 131 from proof recovery (
previous step
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⊦ orphans-cons(fs, ri, ro) ↔ (∀ ino. inodekey(ino) ∈ ri → (fs[ri[inodekey(ino)]].nlink = 0 ∧ ino ≠ ROOT_INO ↔ inodekey(ino) ∈ ro))
A spec-lemma