get_nth_common_rank_between

get_nth_common_rank_between(first: Union[HereditaryStratigraphicColumn, HereditaryStratigraphicSpecimen], second: Union[HereditaryStratigraphicColumn, HereditaryStratigraphicSpecimen], n: int) → int | None

Return the nth rank retained by both columns.

Zero indexed. Returns None if n + 1 common ranks do not exist between first and second.