Help with this python function, getting error not defined

Trying to merge the code into the file but getting error not defined. _SYNTHETIC_BLANKET_MARKER = "_synthetic_blanket_summary_row" def _blanket_number(value: Any) -> str: """Normalize an ACORD blanket number for matching (``"01"`` -> ``"1"``).""" return normalize_location_number(value).casefold() def iter_blanket_summary_entries(propertydata: dict | None) -> list[dict]: """Return blanket-summary rows in source order, retaining duplicate numbers.""" if not isinstance(propert...