 Kōans are accordingly grouped into five categories in a most fully developed system: the first group is designed for reaching li (suchness) (richi) or the body of truth (hosshin), i.e., an enlightenment experience; the second group for a linguistic articulation (gensen) of meditational experiences in order to master the skillful use of language; the third group for those kōans truly difficult to pass (nantō); the fourth group for the practitioner to make an insight of kōan experiences pertinent to daily life (kikan) in order to embody a middle-way in which the practitioner won’t be steeped either in the state of meditation or the activity of daily life; and the fifth group for going beyond the state of buddhahood by erasing all traces of enlightenment in order to achieve a traceless enlightenment (kōjō).