 But corpora are of many different kinds. Some are just very large compilations of text from individual sources such as newspapers of record or the World Wide Web—compilations large enough for the diversity in the source to act as a surrogate for representativeness. For example, a billion words of a newspaper, despite coming from a single source, will include not only journalists’ news reports and prepared editorials but also quoted speech, political rhetoric, humor columns, light features, theater and film reviews, readers’ letters, fiction items, and so on, and will thus provide examples of a much wider variety of styles than one might have thought.