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Proof step 193 from proof inv-format (previous step)

# buf ≥ # vtbl * (ENCODED_NAT_SIZE + ENCODED_VOLID_SIZE) + ENCODED_NAT_SIZE, buf0 = buf, vtbl0 = vtbl ⊦ ⟪encode_vtbl#(; vtbl, buf; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ # buf = # buf0 ∧ (err = ESUCCESS → is-encoded(vtbl0, buf)))

A spec-lemma