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Proof step 15 from proof valid-vtbl-map-indices-erasing (
previous step
)
⊦ valid-indices(wlar, nx) ∧ ¬ dups(nx) ∧ n < # wlar → wlar.mapIndices(nx, f0)[n] = (n ∈ nx ⊃ f0(wlar[n]);wlar[n])
A spec-lemma