Echange de Livres

This would be an author's group in which members would review others members' books and then then submit the reviews to Amazon and possibly Goodreads. No two authors, however, could simultaneously review each other's books. A and B couldn't write reviews on each other's books. But A could review B, and B C, and C could review A. That way, we would be adhering to Amazon's rules while not paying extra.