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Proof step 14 from proof prepost-fix-ecs (previous step)

n0 < # wlar1.mapIndices(nx4, λ wle. wle.ec:= n), n0 < # wlar1, valid-indices(wlar1.mapIndices(nx4, λ wle. wle.ec:= n), nx4), valid-indices(wlar1, nx0), valid-indices(wlar1, nx4) ⊦ wlar1.mapIndices(nx4, λ wle. wle.ec:= n)[n0, wlar1.mapIndices(nx4, λ wle. wle.ec:= n)[n0].ec:= n] = wlar1.mapIndices(nx4, λ wle. wle.ec:= n)[n0, wlar1[n0].ec:= n], dups(nx4 + nx0), dups(nx4), dups(nx0), n0 ∈ nx0, n0 ∈ nx4

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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