With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Fight Club is a film.
text_B: The is a traditional Japanese musical instrument , a zither with seventeen strings .. zither. zither. It is a variant of the koto , which traditionally has thirteen strings .. koto. Koto ( musical instrument ). The instrument is also known as jushichi-genso , `` seventeen-stringed koto , '' or `` bass koto '' -LRB- although kotos with a greater number of strings also exist -RRB- .. koto. Koto ( musical instrument ). The jushichi-gen was invented in 1921 by Michio Miyagi , a musician who felt that the standard koto lacked the range he sought .. koto. Koto ( musical instrument ). Michio Miyagi. Michio Miyagi. His seventeen-stringed creation , sometimes described as a `` bass koto '' , has a deeper sound and requires specialized plectra -LRB- picks worn attached to the player 's fingers with which the strings are plucked -RRB- .. koto. Koto ( musical instrument ). plectra. plectrum. Though his original jushichi-gen was considerably larger than a normal koto , seventeen-stringed koto of a normal koto size are more common today ; these presumably do not have as deep a sound .. koto. Koto ( musical instrument )
not_related.