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Theorem prepost-fix-ecs

valid-indices(wlar, nx), wlar0 = wlar, nx0 = nx, ¬ dups(nx) ⊦ ⟪ubi_fix_ecs#(n; nx, wlar)⟫ (wlar = wlar0.mapIndices(nx0, λ wle. wle.ec:= n))

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