Question: Where was the biggest department store which IBM Printer Model 4 headquartered? 

full_context: Document 1: List of companies of Spain: Spain is a sovereign state located on the Iberian Peninsula in southwestern Europe. It is a middle power and a major developed country with the world's fourteenth largest economy by nominal GDP and sixteenth largest by purchasing power parity. It is a member of the United Nations (UN), the European Union (EU), the Eurozone, the Council of Europe (CoE), the Organization of Ibero-American States (OEI), the North Atlantic Treaty Organization (NATO), the Organisation for Economic Co-operation and Development (OECD), the Schengen Area, the World Trade Organization (WTO) and many other international organisations. Spain has a "permanent invitation" to the G20 summits that occur generally once a year.
Document 2: IBM PS/ValuePoint: The IBM PS/ValuePoint (or just ValuePoint) personal computer was IBM's answer to the PC clone market, where the IBM PS/2 could not compete due to price and proprietary interfaces. Announced in October 1992 and withdrawn in July 1995, it was replaced by the IBM PC Series 300.
Document 3: El Corte Inglés: El Corte Inglés S.A., headquartered in Madrid, is the biggest department store group in Europe and ranks fourth worldwide. El Corte Inglés is Spain's only remaining department store chain, as well as owner of several associated businesses, such as:
Document 4: IBM 4610: The IBM 4610, also known as SureMark, is a famous thermal point-of-sale printer manufactured by IBM, launched in 1996. It is used by major retailers such as Wal-Mart (in most countries, most notably United States and Mexico), Carrefour, Costco, Cencosud, Office Depot, Tesco, Best Buy, Chedraui, King Soopers (and Kroger affiliates), London Drugs and Soriana (Mainly formerly Gigante stores). It had replaced the famous IBM Printer Model 4.
Document 5: International Airlines Group: International Consolidated Airlines Group, S.A., often shortened to IAG, is an Anglo-Spanish multinational airline holding company with its operational headquarters in London, England and its registered office in Madrid, Spain. It was formed in January 2011 after a merger agreement between British Airways and Iberia, the flag carrier airlines of the United Kingdom and Spain respectively. As British Airways was the larger company, those holding shares in British Airways at the time of the merger were given 55% of the shares in the new, merged company. British Airways and Iberia ceased to be independent companies and instead became 100% owned subsidiaries of IAG. It is the sixth-largest airline company in the world, producing €22.567 billion revenue in 2016. The company is listed on the London Stock Exchange and the Madrid Stock Exchange. It is a constituent of the FTSE 100 Index and IBEX 35 Index.
Document 6: Zara (retailer): Zara (] ) is a Spanish clothing and accessories retailer based in Arteixo, Galicia. The company was founded in 1975 by Amancio Ortega and Rosalía Mera. It is the main brand of the Inditex group, the world's largest apparel retailer. The fashion group also owns brands such as Massimo Dutti, Pull and Bear, Bershka, Stradivarius, Oysho, Zara Home, and Uterqüe. Zara as of 2017 manages up to 20 clothing collections a year.
Document 7: IBM PS/1: The IBM PS/1 is a brand for a line of personal computers that marked IBM's return to the home market in 1990, five years after the IBM PCjr. It was replaced by the IBM Aptiva in September 1994.
Document 8: ACS Group: ACS, Actividades de Construcción y Servicios, S.A. (] ) is a Spanish company dedicated to civil and engineering construction, all types services and telecommunications. It is one of the leading construction companies in the world, with projects in many countries around the world. The company was founded in 1997 through the merger of "OCP Construcciones, S.A." and "Ginés Navarro Construcciones, S.A.". The group has a global presence, including countries like Germany, India, Brazil, Chile, Morocco and Australia. The headquarters are in Madrid and the chairman is Florentino Pérez. Listed on the Bolsa de Madrid, the company's shares form part of the IBEX 35 stock market index.
Document 9: Stockmann, Helsinki centre: The Stockmann department store is a culturally significant business building and department store located in the centre of Helsinki, Finland. It is one of many department stores owned by the Stockmann corporation. It is the largest department store in the Nordic countries in terms of area and total sales. The store is known for carrying all the internationally recognised luxury brands, and Stockmann's enjoys a reputation as the primary high-end department store in Finland. "Stockmannin Herkku", the food and beverage department located at the basement level, is renowned for the quality and choice of its foodstuffs. The Stockmann logo represents a set of escalators, which are commonly, but wrongly believed represent the first escalators in Finland. The first escalators in Finland were installed in the Forum department store, Turku (1926)
Document 10: IBM PC Series: The IBM PC Series personal computer was the follow-on to the IBM PS/ValuePoint and IBM Personal System/2. Announced in October 1994 and withdrawn in October 2000, it was replaced by the IBM NetVista, apart from the Pentium Pro-based PC360 and PC365, which were replaced by the IBM IntelliStation.
Document 11: Banco Santander: The Santander Group is a Spanish banking group centered on Banco Santander, S.A. (] ). As its name suggests, the company originated in Santander, Cantabria, Spain.
Document 12: IBM Printer Model 4: The IBM Printer Model 4 was a dot-matrix point-of-sale printer launched in 1991. It and its successor, the IBM 4610, are still used by retailers such as El Corte Inglés, Publix, Zara, and Ripley. The printer was discontinued in 2005.
Document 13: IBM Aptiva: The IBM Aptiva personal computer was introduced in September 1994 as the replacement for the IBM PS/1. The first Aptiva models were based on the Intel 80486 CPU with later models using the Pentium and AMD CPUs. All systems were developed in-house except for the later E series which was developed by Acer. The last system was withdrawn in May 2001 without direct replacement when IBM decided to exit the home market. Customers were directed to the IBM NetVista, which was more targeted to business desktops. Most Aptiva models included a modem and a standby/hibernation feature called "Rapid Resume".
Document 14: Printers Inc. Bookstore: Printers Inc. Bookstore (1978–2001) was an independent bookstore in Palo Alto and Mountain View, California, that closed in 2001. "Printers Inc" is referenced in sonnets 8.13-8.16 of Vikram Seth's 1986 novel, "The Golden Gate."
Document 15: Edeka: The Edeka Group is the largest German supermarket corporation, currently holding a market share of 26%. Founded in 1898, it consists today of several cooperatives of independent supermarkets all operating under the umbrella organisation "Edeka Zentrale AG & Co KG", with headquarters in Hamburg. There are approximately 4,100 stores with the Edeka nameplate that range from small corner stores to hypermarkets. On November 16, 2007, Edeka reached an agreement with Tengelmann (known for A&P in the US) to purchase a 70% majority stake in Tengelmann's Plus discounter store division.
ground_truth: Madrid