Wumen selected the 48 koans and commented on and added a verse for each koan. It was preceded by "Zen Koan", a four hundred page shorter edition in 1965. In the Lin-ji (Rinzai) school this is supplemented with koan study. Cheng-chueh in his turn criticized the emphasis on koan study. One reference credits Narwhal with an additional sinking on 1 August (the tanker "Koan Maru"). It was written by director Tsui Hark and Koan Hui. Hakuin's emphasis on koan practice had a strong influence in the Japanese Rinzai-school. Each koan is accompanied by a commentary and verse by Wumen. The word is also an adjective, as in "Koan goods". A person from Kos is called a "Koan" in English. This connection is touched upon in "The Sluggite Koan". A partial list of koan attributes is below. Run the Jewels, Koan Sound and Supervision. Using these, it is possible to create many different parts inside a koan. It was founded specifically to create and market Koan.