Question: What city shares a border with the headquarters city of Wingas?

full_context: Document 1: Seeberg: Seeberg is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland. The lake Burgäschisee is located on the border with Aeschi. On 1 January 2016 the former municipality of Hermiswil merged into Seeberg.
Document 2: Stellihorn: The Stellihorn is a mountain of the Swiss Pennine Alps, overlooking the lake of Mattmark in the canton of Valais. It lies south of Saas-Almagell in the upper valley of Saas. The north side is covered by a glacier named "Nollen Gletscher".
Document 3: SAS Group: SAS AB (Scandinavian Airlines System Aktiebolag) (, , ), trading as SAS Group, is an airline holding company headquartered in the SAS Frösundavik Office Building in Solna Municipality, Sweden. It is the owner of the airlines Scandinavian Airlines and Scandinavian Airlines Ireland. SAS once owned 19.9% of the now defunct Spanish airline Spanair as well as shares in Estonian Air and Skyways Express. It also owns the aviation services companies SAS Business Opportunities, SAS Cargo Group, SAS Ground Services and SAS Technical Services. In addition, it holds minority ownership of Air Greenland. SAS Group is partially owned by the governments of Sweden and Denmark with a 21.4% and 14.3% ownership, respectively. The remaining 64.3% is held by private owners, of which Foundation Asset Management owns 7.6%. The company is listed on the Oslo Stock Exchange, the Stockholm Stock Exchange, and the Copenhagen Stock Exchange.
Document 4: Wingas: Wingas GmbH is a gas distribution company located in Kassel, Germany. It is a subsidiary of Gazprom, which held its shares through W&G Beteilligungs-GmbH & Co. KG.
Document 5: Schermützelsee: The Schermützelsee is a lake in Brandenburg, Germany. It is located in the town of Buckow in the district Märkisch-Oderland northwest of Müncheberg and east of the Berlin centre. With its surface area of 1.37 km² it is the largest water in the hill country „Märkische Schweiz“ and in the Märkische Schweiz Nature Park.
Document 6: K+S: K+S AG (formerly" Kali und Salz GmbH") is a German chemical company headquartered in Kassel. The company is Europe’s largest supplier of potash for use in fertilizer and, after the acquisition of Morton Salt, the world's largest salt producer. The firm also produces and distributes other mineral fertilizers, such as those from magnesium and sulphur. K+S is mainly active in Europe, North and South America with more than 14,000 employees worldwide (2014).
Document 7: Sweden: At 449,964 km2 (173,732 sq mi), Sweden is the 55th-largest country in the world, the 4th-largest country entirely in Europe, and the largest in Northern Europe. The lowest elevation in Sweden is in the bay of Lake Hammarsjön, near Kristianstad, at −2.41 m (−7.91 ft) below sea level. The highest point is Kebnekaise at 2,111 m (6,926 ft) above sea level.
Document 8: Alatsee: Alatsee is a meromictic lake in Ostallgäu, Bavaria, Germany. At an elevation of 868.0 m, its surface area is 12.00 ha. This lake supposedly holds "Hitler's gold". Many divers have died or disappeared mysteriously in this lake due to the toxicity of the organisms living in this lake. These organisms create the "blood cloud " that occurs quite abundantly throughout the year.
Document 9: Gass (Maharashtra): Gass is a village in Vasai Taluka, near Mumbai in the Maharashtra state of India. In addition to its Hindu residents, it had an approximate Roman Catholic population of 5000 in the year 2009. A really natural village owning a big lake, salt farming, and popular for green vegetables farming.
Document 10: RWE Supply & Trading CZ: RWE Supply & Trading CZ is the largest natural gas trading company in the Czech Republic. It is owned by the German energy company RWE.
Document 11: Private Wings: Private Wings Flugcharter GmbH is a German airline that was founded in 1991 and operates chartered corporate, cargo and air ambulance services out of Berlin Schönefeld Airport. Its head office is located in the General Aviation Terminal (Allgemeine Luftfahrt) on the property of Schönefeld Airport in Schönefeld, Brandenburg.
Document 12: Guardian Pipeline: Guardian Pipeline is a small natural gas pipeline that brings gas from northern Illinois into Wisconsin. It is owned by ONEOK Partners, G.P.. It is operated by ONEOK Partners, L.P. Its FERC code is 184.
Document 13: Hanover: Various industrial businesses are located in Hannover. The Volkswagen Commercial Vehicles Transporter (VWN) factory at Hannover-Stöcken is the biggest employer in the region and operates a huge plant at the northern edge of town adjoining the Mittellandkanal and Motorway A2. Jointly with a factory of German tire and automobile parts manufacturer Continental AG, they have a coal-burning power plant. Continental AG, founded in Hanover in 1871, is one of the city's major companies, as is Sennheiser. Since 2008 a take-over is in progress: the Schaeffler Group from Herzogenaurach (Bavaria) holds the majority of the stock but were required due to the financial crisis to deposit the options as securities at banks. TUI AG has its HQ in Hanover. Hanover is home to many insurance companies, many of which operate only in Germany. One major global reinsurance company is Hannover Re, whose headquarters are east of the city centre.
Document 14: Stellbergsee: Stellbergsee is a lake in Söhre, Landkreis Kassel and Schwalm-Eder-Kreis, Hesse, Germany. At an elevation of 356 m, its surface area is 0.014 km².
Document 15: Hesselberg: Hesselberg (689 m above sea level) is the highest point in Middle Franconia and the Franconian Jura and is situated 60 km south west of Nuremberg, Germany. The mountain stands isolated and far from the center of the Franconian Jura, in its southwestern border region, 4 km to the north west of Wassertrüdingen. The mountain's first recorded name was "Öselberg", which probably derived from "öder Berg" (bleak mountain). This name later changed to "Eselsberg" and finally to the current name "Hesselberg". As a butte the mountain provides an insight into Jurassic geology. It has also witnessed an eventful history, many incidents were handed down from generation to generation and these mixed with facts have become legends. Nowadays many people visit Hesselberg in order to enjoy nature and the wonderful vista. When the weather is clear the Alps 150 km away can be seen.
ground_truth: Schwalm-Eder-Kreis
sub_queries: Wingas >> headquarters location Answer: Kassel
Kassel >> shares border with Answer: Schwalm-Eder-Kreis