@kensanata the lulu.com link is a bad one to plug because it's a #CloudFlare site. Visiting the #InternetArchive of it is also useless in this case because it's just a blank page: https://web.archive.org/web/20200814201044/https://www.lulu.com/en/gb/shop/francisco-ballesteros/introduction-to-os-abstractions-using-plan-9-from-bell-labs/ebook/product-1dnwpknd.html