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Proof step 1 from proof key-index-in-keyset-array-extract (conclusion)

⊦ ar[m] = elemindex(a, m0) ∧ valid-idx(kar, ar, n) ∧ key-index(key, m) ∈ keyset(kar, n) → kar[m0] = key-index(key, m)

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information