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Theorem ll-trav2-end

r2 ≠ null ⊦ h[r2] = a × null → ( ((ll-trav(r0, r1, r2, x) * hP))(h) ↔ x ≠ [] ∧ (r1 = null ⊃ r0 = r2 ∧ ((lls(r0, null, x) * hP))(h) ;∃ y, b. x = (y + b) + a ∧ ((lls(r0, r1, y) * r1 => b × r2 * r2 => a × null * hP))(h) ))

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