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Proof step 2 from proof len (previous step)

true, ∀ s0. # s0 < # s → true → # set2list(s0) = # s0 ⊦ # set2list(s) = # s

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
∀ s0. # s0 < # s → true → # set2list(s0) = # s0 ⊦ # set2list(s) = # s

Rule argument

Additional information