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Proof step 4 from proof abs-nodes-crash (previous step)

⊦ abs-nodes(buf, m, x, lax, true) ∧ is-aligned(n, NODE_HEADER_SIZE) ∧ n ≤ # buf → (∃ x0, lax0. x0 ⊑ x ∧ lax0 ⊑ lax ∧ abs-nodes(subarray(buf, 0, n), m, x0, lax0, true))

Lemma abs-nodes-crash-h