what is circana? circana is a market research company. we track the performance of industries across the u.s. and globally. and when it comes to books, how do you count how many books are sold and what are bestsellers? that's a great question. so our books industry is just one of many that we track at circana, and i am the book's industry analyst. so i work with our books data almost every day and our books data is post based, which means point of sale. and we're getting data across more than a thousand retailers in the us. so every time someone buys a book, we're capturing that sale along with all of the metadata attributes attached to that book. so that includes the amazons and the local bookstores, etc., correct? it includes every major book retailer that you would expect, including those that you mentioned, along with mass merchants like walmart and target or the 1200 independ ent bookstores in the us, along with a variety of other bookstores in 2024. can you tell us how many books were sold in the united states? how many book units?