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Proof step 1 from proof ll-trav1-end (conclusion)

r1 ≠ null ⊦ H[r1] = a × null → (((ll-trav(r0, r1, x) * P))(H) ↔ x ≠ [] ∧ (∃ y. x = y + a ∧ ((lls(r0, r1, y) * r1 => a × null * P))(H)))

System applied rule normalize

And obtained the following new goals

Rule argument

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