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Proof step 117 from proof inv-recover (
previous step
)
⊦ valid-wl(apebs, wlar) ∧ valid-indices(wlar, nx) ∧ ¬ dups(nx) ∧ indices-erasing(wlar, nx) → valid-wl(apebs, wlar.mapIndices(nx, λ wle. wle.ec:= n))
A spec-lemma