premise: The Last Witness () is a 1980 South Korean mystery film directed by Lee Doo-yong, based on the 1974 novel of the same title by Kim Seong-jong. When the film was originally released, a 40-minute portion was cut due to censorship laws of that time. A remake with the same title was released in 2001.
hypothesis: Censorship of the film saw the film cut 5/6 of an hour run time out.
reason: 5/6 of an hour is 48 minutes, the film was cut 40 minutes due to censorship, or 2/3 as a fraction.