Problem: Given the question: Information:  - The Comet V railcar is the fifth generation of the Comet railcar series . Produced by the manufacturer Alstom , the Comet V is a much different type of car compared to previous versions of the series . The Comet V began servicing New York metropolitan area commuter rail operators New Jersey Transit and Metro - North in April 2002 .  - Pendolino (from Italian "pendolo" "pendulum", and "-ino," a diminutive suffix) is an Italian family of tilting trains used in Italy, Spain, Portugal, Slovenia, Finland, Russian Federation, the Czech Republic, the United Kingdom, Slovakia, Switzerland, China, and Poland, and soon Romania. Based on the design of the Italian ETR 401 and the British Advanced Passenger Train, it was further developed and manufactured by Fiat Ferroviaria, which was taken over by Alstom in 2000.  - TGV ("high-speed train") is France's intercity high-speed rail service, operated by SNCF, the national rail operator. It was developed in the 1970s by GEC-Alsthom and SNCF. Originally designed as turbotrains to be powered by gas turbines, the prototypes evolved into electric trains with the 1973 oil crisis. Following the inaugural service between Paris and Lyon in 1981 on the "LGV Sud-Est" ("LGV") (high-speed line), the network, centred on Paris, has expanded to connect main cities across France and in adjacent countries on combinations of high-speed and conventional lines.  - Alstom is a French multinational company operating worldwide in rail transport markets, active in the fields of passenger transportation, signalling and locomotives, with products including the AGV, TGV, Eurostar, and Pendolino high-speed trains, in addition to suburban, regional and metro trains, and Citadis trams.  - Rail transport is a means of conveyance of passengers and goods on wheeled vehicles running on rails, also known as tracks. It is also commonly referred to as train transport. In contrast to road transport, where vehicles run on a prepared flat surface, rail vehicles (rolling stock) are directionally guided by the tracks on which they run. Tracks usually consist of steel rails, installed on ties (sleepers) and ballast, on which the rolling stock, usually fitted with metal wheels, moves. Other variations are also possible, such as slab track, where the rails are fastened to a concrete foundation resting on a prepared subsurface.    What is the relationship between 'comet v' and 'train'?
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The answer is:
instance of


Problem: Given the question: Information:  - Compact executive car is a car classification term applied to premium cars smaller than executive cars. In European classification, compact executive cars are part of the D-segment. In North American terms, close equivalents are "compact premium car", "compact luxury car", "entry-level luxury car" and "near-luxury car". Compact executive cars are usually available in saloon, estate, coupé, and cabriolet body styles.  - Luxury vehicle is a marketing term for a vehicle that provides luxury  pleasant or desirable features beyond strict necessity  at increased expense (see luxury goods).  - Bavaria  is a federal state of Germany. Located in the German southeast with an area of 70,548 square kilometres (27,200 sq mi), Bavaria is the largest German state. Its territory comprises roughly a fifth of the total land area of Germany, and, with 12.9 million inhabitants, it is Germany's second most populous state. Munich, Bavaria's capital and largest city, is the third largest city in Germany.  - A commercial vehicle is any type of motor vehicle used for transporting goods or paid passengers. The European Union defines a "commercial motor vehicle" as any motorised road vehicle, that by its type of construction and equipment is designed for, and capable of transporting, whether for payment or not: (1) more than nine persons, including the driver; (2) goods and "standard fuel tanks". This means the tanks permanently fixed by the manufacturer to all motor vehicles of the same type as the vehicle in question and whose permanent fitting lets fuel be used directly, both for propulsion and, where appropriate, to power a refrigeration system. Gas tanks fitted to motor vehicles for the direct use of diesel as a fuel are considered standard fuel tanks.  - Executive car is a British term for an automobile larger than a large family car. In official use, the term is adopted by Euro NCAP, a European organization founded to test car safety.  - Volkswagen Group, or Volkswagen Aktiengesellschaft, shortly VW AG, is a German multinational automotive manufacturing company headquartered in Wolfsburg, Lower Saxony, Germany. It designs, manufactures and distributes passenger and commercial vehicles, motorcycles, engines, and turbomachinery and offers related services including financing, leasing and fleet management. In 2016, it was the largest automaker in the world with sales 10.3 million units. It has maintained the largest market share in Europe for over two decades. It ranked seventh in the 2016 Fortune Global 500 list of the world's largest companies.  - The Audi A4 is a line of compact executive cars produced since late 1994 by the German car manufacturer Audi , a subsidiary of the Volkswagen Group . The A4 has been built in four generations and is based on the Volkswagen Group B platform . The first generation A4 succeeded the Audi 80 . The automaker 's internal numbering treats the A4 as a continuation of the Audi 80 lineage , with the initial A4 designated as the B5 - series , followed by the B6 , B7 , B8 and the B9 . The B8 and B9 versions of the A4 are built on the Volkswagen Group MLB platform shared with many other Audi models and potentially one Porsche model within Volkswagen Group . The Audi A4 automobile layout consists of a longitudinal engine front - engine design , with transaxle - type transmissions mounted at the rear of the engine . The cars are front - wheel drive , or on some models , `` quattro '' all - wheel drive . The A4 is available as a sedan and station wagon . The second ( B6 ) and third generations ( B7 ) of the A4 also had a convertible version , but the B8 version of the convertible became a variant of the Audi A5 instead as Audi got back into the compact executive coupé segment .  - Germany, officially the Federal Republic of Germany, is a federal parliamentary republic in central-western Europe. It includes 16 constituent states, covers an area of , and has a largely temperate seasonal climate. With about 82 million inhabitants, Germany is the most populous member state of the European Union. After the United States, it is the second most popular immigration destination in the world. Germany's capital and largest metropolis is Berlin. Other major cities include Hamburg, Munich, Cologne, Frankfurt, Stuttgart and Düsseldorf.  - Audi is a German automobile manufacturer that designs, engineers, produces, markets and distributes luxury vehicles. Audi oversees worldwide operations from its headquarters in Ingolstadt, Bavaria, Germany. Audi-branded vehicles are produced in nine production facilities worldwide.    What is the relationship between 'audi a4' and 'family car'?
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The answer is:
series