def _store_chunks_in_order(seen: str, unseen: str, seen_first: bool) -> list:
    """
    Save two strings (a 'seen' and an 'unseen' string) in an array where the 'seen' string is
    the first element if the seen_first parameter is True.

    @param seen: The 'seen' string
    @param unseen: The 'unseen' string
    @return: An array where either the seen or unseen strings are the first/second element
             depending on the value of the seen_first parameter.
    """
    if seen_first:
        return [seen, unseen]
    else:
        return [unseen, seen]