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Proof step 1 from proof lastn-neq-04 (conclusion)

⊦ n ≤ # x ∧ b ∈ y ∧ ¬ b ∈ x → lastn(n, x) ≠ a ' + y

System applied rule normalize

And obtained the following new goals

Proof step 2:
lastn(n, x) = a ' + y, b ∈ y, n ≤ # x ⊦ b ∈ x

Rule argument

Additional information