Exercises 67–72 are based on the following jokes about books:
• “Outside of a dog, a book is man’s best friend. Inside of a dog, it’s too dark to read.”—Groucho Marx
• “I recently bought a book of free verse. For $12.” —George Carlin
• “If a word in the dictionary was misspelled, how would we know?”—Steven Wright
• “Encyclopedia is a Latin term. It means ‘to paraphrase a term paper.’ ”—Greg Ray
• “A bookstore is one of the only pieces of evidence we have that people are still thinking.”—Jerry Seinfeld
• “I honestly believe there is absolutely nothing like going to bed with a good book. Or a friend who’s read one.” —Phyllis Diller

In how many ways can people select their three favorite jokes from these comments about books?