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Proof step 14 from proof always-noincrease-stable (previous step)

□ A = a, A ≠ a, boolvar → a = a1 ∧ n = n0, \A ∀ N, A, a. N < n → □ A = a → ¬ N = N'' +1 until A'' ≠ A ⊦

User applied rule always left

And closed the goal!

Rule argument

pos: left 1

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