Problem: Information:  - China, officially the People's Republic of China (PRC), is a unitary sovereign state in East Asia. With a population of over 1.381 billion, it is the world's most populous country. The state is governed by the Communist Party of China, and its capital is Beijing. It exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities (Beijing, Tianjin, Shanghai, and Chongqing), and two mostly self-governing special administrative regions (Hong Kong and Macau), and claims sovereignty over Taiwan. The country's major urban areas include Shanghai, Guangzhou, Beijing, Chongqing, Shenzhen, Tianjin and Hong Kong. China is a great power and a major regional power within Asia, and has been characterized as a potential superpower.  - The 2006 World Junior Championships in Athletics is the 2006 version of the World Junior Championships in Athletics . It was held from 15 August to 20 August at the Chaoyang Sports Centre in Beijing , the capital of the People 's Republic of China . The Championships were dominated by the host nation China , and Kenya . The United States showed a near complete domination in the relay events . Estonia won four gold medals ; their first medals ever at the World Junior Championships .  - Chaoyang Sports Centre (Simplified Chinese: ) is a multi-use stadium in Beijing, China. It is currently used mostly for athletics matches. The stadium is able to hold 8,000 people and was opened in 2003. It hosted the events for the 2006 IAAF World Junior Championships in Athletics.  - Hebei (postal: Hopeh) is a province of China in the North China region. Its one-character abbreviation is "" (Jì), named after Ji Province, a Han Dynasty province ("zhou") that included what is now southern Hebei. The name "Hebei" literally means "north of the river", referring to its location entirely to the north of the Huang He  (Yellow River).  - Beijing (formerly romanised as Peking) is the capital of the People's Republic of China and the world's third most populous city proper. It is also one of the world's most populous capital cities. The city, located in northern China, is governed as a direct-controlled municipality under the national government with 16 urban, suburban, and rural districts. Beijing Municipality is surrounded by Hebei Province with the exception of neighbouring Tianjin Municipality to the southeast; together the three divisions form the Jingjinji metropolitan region and the national capital region of China.  - Tianjin, formerly romanized as Tientsin, is a metropolis in northern coastal Mainland China, administered by the People's Republic of China and one of the five national central cities of China, with a total municipal population of 15,469,500. It is governed as one of the four direct-controlled municipalities of the PRC and is thus under direct administration of the central government. Tianjin borders Hebei Province and Beijing Municipality, bounded to the east by the Bohai Gulf portion of the Yellow Sea. Part of the Bohai Economic Rim, it is the largest coastal city in northern China.  - A stadium (plural stadiums or stadia) is a place or venue for (mostly) outdoor sports, concerts, or other events and consists of a field or stage either partly or completely surrounded by a tiered structure designed to allow spectators to stand or sit and view the event.    Given the information, choose the subject and object entities that have the relation of 'instance of'.

A: 2006 world junior championships in athletics , iaaf world junior championships in athletics


[Q]: Information:  - Black metal is an extreme subgenre and subculture of heavy metal music. Common traits include fast tempos, a shrieking vocal style, heavily distorted guitars played with tremolo picking, raw (lo-fi) recording, unconventional song structures, and an emphasis on atmosphere. Artists often appear in corpse paint and adopt pseudonyms.  - Heavy metal (or simply metal) is a genre of rock music that developed in the late 1960s and early 1970s, largely in the United Kingdom and the United States. With roots in blues rock and psychedelic/acid rock, the bands that created heavy metal developed a thick, massive sound, characterized by highly amplified distortion, extended guitar solos, emphatic beats, and overall loudness. Heavy metal lyrics and performance styles are sometimes associated with aggression and machismo.  - Stian Aarstad is a Norwegian pianist and keyboard player best known for his five - year ( 1992 -- 97 ) stint with the black metal band Dimmu Borgir during which he played keyboards and synthesizers while engendering criticism and controversy for appearing onstage and performing in a top - hat - and - cape outfit reminiscent of Jack the Ripper , while wearing minimal corpse makeup and not moving or showing any emotion . Upon joining Dimmu Borgir , he did n't listen to metal music , preferring only to listen to classical . In 1998 to 1999 , he produced a demo - EP for the unblack metal band Vaakevandring . In the 2000s , Aarstad had been the pianist for the band Enthral , but left his regular position during the recording of the band 's third album .  - Dimmu Borgir (or or ) is a Norwegian symphonic black metal band from Oslo, Norway, formed in 1993. The name is derived from Dimmuborgir, a volcanic formation in Iceland, the name of which means "dark cities" or "dark castles/fortresses" in Icelandic, Faroese and Old Norse. The band has been through numerous lineup changes over the years; guitarist Silenoz and vocalist Shagrath are the only original members who still remain with guitarist Galder being a longstanding member.  - Jack the Ripper is the best known name given to an unidentified serial killer generally believed to have been active in the largely impoverished areas in and around the Whitechapel district of London in 1888. The name "Jack the Ripper" originated in a letter written by someone claiming to be the murderer that was disseminated in the media. The letter is widely believed to have been a hoax and may have been written by journalists in an attempt to heighten interest in the story and increase their newspapers' circulation. The killer was called "the Whitechapel Murderer" as well as "Leather Apron" within the crime case files, as well as in contemporary journalistic accounts.  - Whitechapel is a district in the East End of London, England, in the London Borough of Tower Hamlets.  - London is the capital and most populous city of England and the United Kingdom, as well as the most populous city proper in the European Union. Standing on the River Thames in the south east of the island of Great Britain, London has been a major settlement for two millennia. It was founded by the Romans, who named it "Londinium". London's ancient core, the City of London, largely retains its medieval boundaries. Since at least the 19th century, "London" has also referred to the metropolis around this core, historically split between Middlesex, Essex, Surrey, Kent, and Hertfordshire, which today largely makes up Greater London, governed by the Mayor of London and the London Assembly.  - Dimmuborgir ("dimmu" "dark", "borgir" "cities" or "forts", "castles"); pronounced ) is a large area of unusually shaped lava fields east of Mývatn in Iceland. The Dimmuborgir area is composed of various volcanic caves and rock formations, reminiscent of an ancient collapsed citadel (hence the name). The dramatic structures are one of Iceland's most popular natural tourist attractions.    Given the information, choose the subject and object entities that have the relation of 'country of citizenship'.
****
[A]:
stian aarstad , norway