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Proof step 1 from proof valid-eraseqw-subarray-shift (conclusion)

n < # wlar, stat ≠ erasing ⊦ valid-eraseq(subarray(wlar, 0, n), q) → valid-eraseq(subarray(wlar[n, wl-entry(m, stat)], 0, n + 1), q)

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information