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Proof step 14 from proof not-always-decrease (previous step)

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

User applied rule insert equation

And obtained the following new goals

Proof step 15:
□ ⟨a0 := A⟩ (◇ A ≪ a0), ◇ (a = A ∧ A ≪ a0), a0 = A ⊦ a ≪ a0

Rule argument

pos: left 3 flags: rotate

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