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Proof step 1 from proof lls-fold-tail (conclusion)

x ≠ [] ⊦ ((r1 => x.last × r2 * lls(r0, r1, x.butlast) * P))(H) → ((lls(r0, r2, x) * P))(H)

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information