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Proof step 8 from proof abs-nodes-add-crash-aligned (previous step)

⊦ abs-nodes(buf0, m, x, lax, false) ∧ abs-node(buf1, a) ∧ is-aligned(n, NODE_HEADER_SIZE) ∧ is-aligned(m, NODE_HEADER_SIZE) ∧ n ≤ # buf0 + # buf1 ∧ abs-nodes(subarray(buf0 + buf1, 0, n), m, x + a ', lax + @(m + # buf0, a.flashsize) ', boolvar) → n = # buf0 + # buf1

Lemma abs-nodes-add-crash-aligned-h