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Theorem ll-trav2-nonnull-def

⊦ r1 ≠ null → (((ll-trav(r0, r1, r2, x) * hP))(h) ↔ (∃ x0, x1, a. x = x0 + (a + x1) ∧ ((lls(r0, r1, x0) * r1 => a × r2 * lls(r2, null, x1) * hP))(h)))