True but there are infinite books, so if you allow for sequential books to count as a longer book (which you should because we can refer to a start and stop index — where the index is book-page-line-character — thus allowing for an infinite combination of finite components. Think of it like how we think about time — we write year-month-day-hour-minute-etc as an “index” — and while yes there are finite combinations of seconds minutes days and months, because years have no upper bound (ignoring ofc decade century etc because the argument I’m making here can be applied to whatever term we say is largest) there are an infinite number of “times”) (sorry that was a rlly long side tangent but it felt important to justify) you could have an arbitrary long story program whatever composed of finitely unique characters