E-rank (Eランク, ī ranku) is one of the six classifications. It is followed by D-rank. It is used exclusively when classifying techniques intended for Academy Students. A number of E-rank techniques must be learned before ninja can graduate, and are only difficult in the sense that students may not have learned how to properly control their chakra. With time, E-rank techniques like the Body Replacement Technique become second nature for seasoned ninja.