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Proof step 185 from proof inv-read-gblock-nodes (previous step)

⊦ is-aligned(# buf, NODE_HEADER_SIZE) ∧ is-aligned(m, NODE_HEADER_SIZE) → (range=(buf + mkempbuf(n), m, validtrailer, 0, NODE_HEADER_SIZE) ↔ range=(buf, m, validtrailer, 0, NODE_HEADER_SIZE))

Proof step 185 from proof inv-read-gblock-nodes (previous step)

Lemma range-eq-validtrailer