After the success of The Cat in the Hat, Random House set up its Beginner Books division for Dr. Seuss and his wife to create exciting books for beginning readers. Furthering the challenge of The Cat in the Hat's limit of 225 vocabulary words, Bennet Cerf challenged him to write a book with an arbitrary limit of just 50 vocabulary words. The result was Green Eggs and Ham. It has become, according to its publisher, the third best-selling book in the English language. Publisher's Weekly notes that through the end of the year 2000, Green Eggs and Ham is the 4th highest seller in domestic (U.S.) sales of all time.