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Proof step 13 from proof prepost-fix-ecs (
previous step
)
⊦ ¬ n ∈ nx ∧ valid-indices(wlar, nx) ∧ n < # wlar → wlar.mapIndices(nx + n ', f0) = wlar.mapIndices(nx, f0)[n, f0(wlar[n])]
A spec-lemma