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Proof step 1 from proof range-le (conclusion)

⊦ n + 1 < nused ∧ zbrar[n].key ≤ key ∧ nused ≤ # zbrar → key-range(zbrar, n, nused, ri |≤ key) = key-range(zbrar, n, nused, ri)

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information