Book Trees (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption In these two book trees, the one on the left was produced with the FFP technique and correctly groups the Koran with other religious works. The other tree was produced with a standard word frequency analysis and misplaces the Koran with The Republic and Apologies. Note also the misplacing of the Odyssey and The Illiad. Credit Courtesy of Sung-Hou Kim, Berkeley Lab Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.