Blue Cliff Record
To attain kensho, most students are assigned the mu-koan. After breaking through, the student first studies twenty-two "in-house" koans, which are "unpublished and not for the general public". There-after, the students goes through the "Gateless Gate" (Mumonkan), the "Blue Cliff Record", the "Book of Equanimity", the "Record of Transmitting the Light", the "Five Ranks" and finally more than 100 "Precept Koans".