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Proof step 54 from proof inv-read-gblock-nodes (previous step)

n + NODE_HEADER_SIZE ≤ # buf ⊦ ⟪decode_header#(n, buf; ndhd; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded(ndhd, subarray(buf, n, NODE_HEADER_SIZE))))

A spec-lemma