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Proof step 15 from proof not-always-decrease (previous step)

□ ⟨a0 := A⟩ (◇ A ≪ a0), ◇ (a = A ∧ A ≪ a0), a0 = A ⊦ a ≪ a0

User applied rule execute eventually

And closed the goal!

Rule argument

pos: left 2

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