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Proof step 2 from proof sw (previous step)

⊦ ins≤(a, ins≤(b, [])) = ins≤(b, ins≤(a, []))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ ins≤(a, b ') = ins≤(b, a ')

Rule argument

Additional information

Used simplifier rules: ins-e: ⊦ ins≤(a, []) = a ';