Arp Schnitger
Encyclopedia
Arp Schnitger was a highly influential German organ
Organ (music)
The organ , is a keyboard instrument of one or more divisions, each played with its own keyboard operated either with the hands or with the feet. The organ is a relatively old musical instrument in the Western musical tradition, dating from the time of Ctesibius of Alexandria who is credited with...

 builder. He was primarily active in Northern Europe
Northern Europe
Northern Europe is the northern part or region of Europe. Northern Europe typically refers to the seven countries in the northern part of the European subcontinent which includes Denmark, Estonia, Latvia, Lithuania, Norway, Finland and Sweden...

, especially the Netherlands
Netherlands
The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

 and Germany
Germany
Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

, where a number of his instruments survive to the present day; his organs can also be found as far away as Portugal and Brazil.

Notable examples still in use include the organ at St. Pancratiuskirche, Neuenfelde
Neuenfelde
Neuenfelde is a rural quarter located in the borough Harburg of Hamburg, Germany near the Lower Saxony border. The quarter is well known for its quality of fruit and unique houses, many of which prove to be popular attractions for tourists passing through, it belongs to the Altes Land region and is...

, Hamburg
Hamburg
-History:The first historic name for the city was, according to Claudius Ptolemy's reports, Treva.But the city takes its modern name, Hamburg, from the first permanent building on the site, a castle whose construction was ordered by the Emperor Charlemagne in AD 808...

 http://www.schnitgerorgel.de/html/empty.html (completed in 1688, his largest two-manual instrument); St. Jacobikirche, Hamburg (perhaps the most famous surviving Schnitger organ, completed in 1693)http://www.arpschnitger.nl/shamb.html; St. Martinikerk, Groningen, the Netherlands (1692)http://www.arpschnitger.nl/sgro03.html; St. Ludgerikirche, Norden (1688)http://www.arpschnitger.nl/snorden.html; St. Cosmae und Damianikirche, Stade (Schnitger's first organ, completed in 1676 after the death of his teacher Berendt Huss)http://www.arpschnitger.nl/sstade.html; St. Peter und Paulkirche, Cappel (perhaps the most authentic of Schnitger's organs still in existence, originally in the Johanniskirche, Hamburg, 1680)http://www.arpschnitger.nl/scappel.html; and St. Michaeliskerk, Zwolle, the Netherlands (completed by his son Franz Caspar after Schnitger's death)http://www.arpschnitger.nl/szwolle.html. Organs like this are credited with inspiring the renaissance in organ building during the early twentieth century, with a return to tracker action
Tracker action
Tracker action is a term used in reference to pipe organs and steam calliopes to indicate a mechanical linkage between keys or pedals pressed by the organist and the valve that allows air to flow into pipe of the corresponding note...

 and smaller, more cohesive instruments, as distinct from the late-Romantic trend of extremely large symphonic organs. In particular, the organ at the Jacobikirche, Hamburg, played a pivotal role in the organ reform movement
Organ reform movement
The Organ Reform Movement or Orgelbewegung was an early 20th century trend in pipe organ building, originating in Germany and already influential in the United States in the 1940s, waning only in the 1980s...

 beginning in 1925, as a series of conferences taking place at historical organ sites in Germany and Alsace was inaugurated there.

The importance of Schnitger to the history of organ building cannot be overestimated. Schnitger was one of the most prolific builders of his time, completing more than 150 instruments and running several shops. His organ designs typify the essential North German organ: multiple divisions, usually with a rückpositif (division on the gallery rail, behind the player's back); large, independent pedal divisions, often placed in towers on either side of the main case; well-developed principal choruses in each division with abundant reeds, flutes, and mutation stops; and meantone temperament
Meantone temperament
Meantone temperament is a musical temperament, which is a system of musical tuning. In general, a meantone is constructed the same way as Pythagorean tuning, as a stack of perfect fifths, but in meantone, each fifth is narrow compared to the ratio 27/12:1 in 12 equal temperament, the opposite of...

. All of these features could be found on North German organs prior to Schnitger's activity; Schnitger's genius lay in his ability to synthesize these elements into a prototypical style of organ building, and in his prolific output. The latter was made possible by his good business sense: Schnitger was one of the first builders to use cost-cutting measures on a large scale to ensure the affordability of organs for small village churches.

Many of Schnitger's landmark instruments were actually rebuilds or expansions of existing organs (as at St. Jacobikirche, Hamburg, a renovation and enlargement of an earlier instrument by Fritzsche, 1635). Often, the expansion of the pedal division required the addition of pedal towers on either side of the case. This feature has come to be one of the most-typically associated with the North German style, despite the fact that a majority of smaller organs did not have pedal towers.

A number of Schnitger's organs were featured on recordings by E. Power Biggs
E. Power Biggs
Edward George Power Biggs , more familiarly known as E. Power Biggs, was a British-born American concert organist and recording artist.-Biography:...

, who is generally credited with reintroducing them to modern listeners. More recently, Schnitger's organs can be heard on several recordings by German organist Harald Vogel
Harald Vogel
Harald Vogel is a German organist, organologist, and author. He is a leading expert on Renaissance and Baroque keyboard music. He has been professor of organ at the University of the Arts Bremen since 1994.-Books & articles:...

. Schnitger's instruments in Groningen, Uithuisen, Nordbroek and Nieuw Scheemda were featured in the documentary Martinikerk Rondeau
Martinikerk Rondeau
Martinikerk Rondeau is a 110 minute documentary film directed by Will Fraser and produced by Fugue State Films for Boeijenga Music Publications, about the historic organs of the Dutch province of Groningen...

, in which Jurgen Ahrend
Jürgen Ahrend
Jürgen Ahrend is a German organ builder famous for restoring instruments such as the Rysum organ and the Arp Schnitger organ in St. Jacobi, Hamburg as well as building original instruments...

, Cor Edskes
Cor Edskes
Cor Edskes is one of the most important authorities on the history of organ building in Northern Europe. He acted as the consultant for the restoration of many of Europe's most important historical organs, including those in the Nieuwe Kerk and Roskilde Cathedral...

 and Bernhardt Edskes detail Schnitger's life and demonstrate his working methods. Schnitger's organs have also served as inspiration for many modern builders; GOArt
GOArt
GOArt is a research center based in Gothenburg, Sweden. The institute conducts research in organ building and organ performance from a wide variety of angles....

, a Swedish organ building consortium, has even gone so far as to build an exact copy of a Schnitger organ for research purposes.

Surviving Schnitger organs

year town church | picture manuals stops | original by Schnitger
1668–75/88 Stade
Stade
Stade is a city in Lower Saxony, Germany and part of the Hamburg Metropolitan Region . It is the seat of the district named after it...

 (D)
St. Cosmae et Damiani
St. Cosmae et Damiani (Stade)
The Church of Saints Cosmas and Damian, Stade is a Lutheran church in Stade, Germany.The church was built in the early 12th century and expanded in the 17th. The Baroque altar was crafted by Christian Precht in 1674–77, and the organ was built in 1668–75 by Berendt Hus and his nephew,...

III/P 42 case, prospect, 35 stops (8 partly)
1677–79 Bülkau
Bülkau
Bülkau is a municipality in the district of Cuxhaven, in Lower Saxony, Germany.-History: Bülkau belonged to the Prince-Archbishopric of Bremen, a territory of imperial immediacy established in 1180. In the mid-16th c. Bülkau adopted Lutheranism...

 (D)
St. John the Baptist I 10 (?) case, prospect; today II/P/22
1678–79/1709 Jork
Jork
Jork is a small town on the left bank of the Elbe, near Hamburg .Jork belongs to the district of Stade, in Lower Saxony. The town is the capital of the Altes Land, one of the biggest fruit growing areas in Europe, and Jork is home to a Fruit Research Center.-History:Jork was mentioned for the first...

 (D)
St. Matthias III/P 35 case, prospect; today II/P/22
1680 Cappel
Cappel, Lower Saxony
Cappel is a municipality in the district of Cuxhaven, in Lower Saxony, Germany.-History:Cappel, a town in the Land of Wursten, for long periods a rather autonomous peasant republic, had long been claimed by the Prince-Archbishopric of Bremen, which finally subjected the Land of Wursten in 1524. In...

 (D)
St. Peter and Paul II/P 30 case, prospect, 18 stops, 10 other old stops re-used by Schnitger
1678–82 Oederquart
Oederquart
Oederquart is a municipality in the district of Stade, Lower Saxony, Germany.It belonged to the Prince-Archbishopric of Bremen. In 1648 the Prince-Archbishopric was transformed into the Duchy of Bremen, which was first ruled in personal union by the Swedish and from 1715 on by the Hanoverian Crown....

 (D)
St. Johannis III/p 28 case, prospect; today II/P/17
1682–83 Lüdingworth (D) St. Jacobi III/P 35 case, prospect, 14 stops (complete or partly), much old pipework reused by Schnitger (half of the organ)
1684 Elmshorn
Elmshorn
Elmshorn is a town in the district of Pinneberg in Schleswig-Holstein in Germany. It is located 32 km north of Hamburg at the small river Krückau, close to the Elbe river, is the sixth-largest city in the state of Schleswig-Holstein, Germany...

 (D)
St. Nicolai II/P 23 case; today III/P/33
1686 Hamburg
Hamburg
-History:The first historic name for the city was, according to Claudius Ptolemy's reports, Treva.But the city takes its modern name, Hamburg, from the first permanent building on the site, a castle whose construction was ordered by the Emperor Charlemagne in AD 808...

-Bergstedt (D)
Ev. Church I 8 case, 2-3 stops
1687 Blankenhagen
Blankenhagen
Blankenhagen is a municipality in the Rostock district, in Mecklenburg-Vorpommern, Germany....

 (D)
Village Church II/p 12 case, 4-5 stops
1687 Steinkirchen
Steinkirchen, Lower Saxony
Steinkirchen is a municipality in the district of Stade, Lower Saxony, Germany.It belonged to the Prince-Archbishopric of Bremen. In 1648 the Prince-Archbishopric was transformed into the Duchy of Bremen, which was first ruled in personal union by the Swedish and from 1715 on by the Hanoverian...

 (D)
St. Nicolai et Martini II/P 28 case, prospect, 13 stops, 8 other partly
1683–88 Hamburg
Hamburg
-History:The first historic name for the city was, according to Claudius Ptolemy's reports, Treva.But the city takes its modern name, Hamburg, from the first permanent building on the site, a castle whose construction was ordered by the Emperor Charlemagne in AD 808...

-Neuenfelde (D)
St. Pankratius II/P 34 case, prospect, 18 stops
1688 Mittelnkirchen
Mittelnkirchen
Mittelnkirchen is a municipality in the district of Stade, Lower Saxony, Germany.-History:Mittelnkirchen belonged to the Prince-Archbishopric of Bremen. In the mid-16th c. the inhabitants adopted Lutheranism...

 (D)
St. Bartholomäus II/p 22 6-8 stops; today II/P/32
1688–90 Hollern
Hollern-Twielenfleth
Hollern-Twielenfleth is a municipality in the district of Stade, Lower Saxony, Germany.-History:In the year 1059 the district Twielenfleth was founded. It then belonged to the Prince-Archbishopric of Bremen. In 1648 the Prince-Archbishopric was transformed into the Duchy of Bremen, which was first...

 (D)
St. Mauritius II/P 24 case, prospect, 13 stops (complete or partly)
1686–88/1691–92 Norden
Norden, Lower Saxony
Norden is a town in the district of Aurich, in Lower Saxony, Germany. It is situated on the North Sea shore, in East Frisia.-External links:* *...

 (D)
St. Ludgeri III/P 46 case, 13 stops, 8 old stops reused by Schnitger
1691–92 Groningen (NL) Martinikerk
Martinikerk
Martinikerk is the oldest church in Groningen, The Netherlands. The church and its associated tower are named after Saint Martin of Tours , the patron saint of the Archbishopric of Utrecht to which Groningen belongs....

III/P 53 case of the pedal, prospect, 6 stops, other old stops reused by Schnitger; today III/P/52
1689–93 Hamburg
Hamburg
-History:The first historic name for the city was, according to Claudius Ptolemy's reports, Treva.But the city takes its modern name, Hamburg, from the first permanent building on the site, a castle whose construction was ordered by the Emperor Charlemagne in AD 808...

 (D)
St. Jacobi
St. Jacobi, Hamburg
The St. Jacobi church is one of the five principal Lutheran churches of Hamburg, Germany. The church is located directly in the city center, has a 125 m tall tower and features a famous organ by Arp Schnitger from 1693. It is dedicated to St James the Greater and often incorrectly known in English...

IV/P 60 43 stops (complete or partly), some reused by Schnitger → Schnitger organ (Hamburg)
Schnitger organ (Hamburg)
The Arp Schnitger organ in St. Jacobi Church, Hamburg, , one of the five Hauptkirchen of Hamburg, is a world-famous monument of North-German organ building, and the largest surviving baroque organ in Northern Europe....

1693 Groningen (NL) Pelstergasthuiskerk II/p 20 case, 2 register (7 partly)
1693 Eutin
Eutin
Eutin is the district capital of Eastern Holstein located in the northern German state of Schleswig-Holstein. As of 2005, it had some 17,000 inhabitants....

 (D)
castle I 9 case
1693–94 Grasberg
Grasberg
Grasberg is a municipality in the district of Osterholz, in Lower Saxony, Germany. It is situated approx. 13 km southeast of Osterholz-Scharmbeck, and 20 km northeast of Bremen.-History:...

 (D)
Luth. Church II/P 21 case, 14 stops
1695–96 Noordbroek
Noordbroek
Noordbroek is a village in the Dutch province of Groningen. It is located in the municipality of Menterwolde, about 8 km northeast of Hoogezand.Noordbroek was a separate municipality until 1965, when it became part of Oosterbroek.-External links:*...

 (NL)
Hervormde Kerk II/P 20 case, 10-11 stops; today II/P/24
1695–96 Harkstede
Harkstede
Harkstede is a small village in Slochteren, Groningen , the Netherlands. Its name is "Haarkstee" in the local dialect, the Gronings. The name is probably meant as "Arkes Stee", which means "pleace for a ark = church". Harkstede has about 3000 inhabitants, what makes it one of the smaller villages...

 (NL)
Hervormde Kerk I 7 case, prospect, 5 stops; today I/p/9 (10)
1696–97 Peize
Peize
Peize is a village in the Dutch province of Drenthe. Located in the northern part of Drenthe approximately 10 kilometers South of the city of Groningen...

 (NL)
Hervormde Kerk II/P 22 case, prospect, 4-6 stops, old stops reused by Schnitger
1697–98 Strückhausen
Stedingen
Stedingen is an area north of Bremen in the delta of the Weser river in north-western Germany.-Founding:In the year 1106, five Dutchmen made a long journey from the mouth of the Rhine to Bremen. They wanted to talk to the Archbishop of Bremen about taking over settling land on the Weser River,...

 (D)
St. Johannes II/p 12 case of the Hauptwerk, 2 stops; today II/P/15
1697–98 Dedesdorf
Loxstedt
Loxstedt is a municipality in the district of Cuxhaven in Lower Saxony, Germany. It is situated south of Bremerhaven.- History :...

 (D)
St. Laurentius II/p 12 case of the manuals, 10 stops; today II/P/18
1697–98 Golzwarden (D) St. Bartholomäus II/P 20 case; today II/P/22
1699 Nieuw-Scheemda
Scheemda
Scheemda is a former municipality and a town in the northeastern Netherlands. Since January 1, 2010 it forms a part of Oldambt.- Population centres :Heiligerlee, Midwolda, Nieuw-Scheemda, Nieuwolda, Oostwold, Scheemda, 't Waar and Westerlee....

 (NL)
Hervormde Kerk I/p 8 case, 4-6 stops
1696–99 Mensingeweer
De Marne
De Marne is a municipality in the northeast of the Netherlands.- Population centres :Broek, Eenrum, Hornhuizen, Houwerzijl, Kleine Huisjes, Kloosterburen, Kruisweg, Lauwersoog, Leens, Mensingeweer, Molenrij, Niekerk, Pieterburen, Schouwerzijl, Ulrum, Vierhuizen, Warfhuizen, Wehe-den Hoorn,...

 (NL)
Hervormde Kerk I 9 case, prospekt, 6 stops
1699 Ganderkesee
Ganderkesee
Ganderkesee is a municipality in Oldenburg district, in Lower Saxony, Germany.-Geographical Location:Ganderkesee is located on the northern edge of a nature park called "Wildeshauser Geest". The northernmost part of the community is in the glacial valley of the Weser...

 (D)
St. Cyprian und Cornelius II/p 16 case, prospect, 9 stops; today II/P/22
1700–01 Uithuizen
Uithuizen
Uithuizen is a village in the Dutch province of Groningen. It is located in the municipality of Eemsmond. Uithuizen has a railway station.Uithuizen was a separate municipality until 1979, when it became part of Hefshuizen....

 (NL)
Hervormde Kerk II/P 28 case, 19 stops, 6 others partly
1701 Maia, Portugal
Maia, Portugal
Maia Municipality is located in the Porto Metropolitan Area, Grande Porto subregion, in Norte Region, Portugal. The city of Maia includes the parishes of Gueifães, Maia and Vermoim, and has 39,949 inhabitants. The Maia Municipality comprises 135,049 inhabitants in 17 parishes for a total land...

Monastery Church San Salvador http://www.arpschnitger.nl/smoreira12.jpg II 12 case, 11 stops
1701 Mariana, Minas Gerais
Mariana, Minas Gerais
Mariana is the oldest city in the state of Minas Gerais, Brazil. It is a touristic city, founded on July 16, 1696, and retains the characteristics of a baroque city, with its churches, buildings and museums.-Further reading:...

 (Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

)
Cathedral Nossa Senhora da Assunção II/p 18 case, prospect, 14 stops (complete or partly); probably by Schnitger's co-worker Heinrich Hullenkampf
1701 Faro, Portugal
Faro, Portugal
Faro is the southernmost city in Portugal. It is located in the Faro Municipality in southern Portugal. The city proper has 41,934 inhabitants and the entire municipality has 58,305. It is the seat of the Faro District and capital of the Algarve region...

Cathedral II 22 probably by Schnitger's co-worker Heinrich Hullenkampf
1699–1702 Clausthal-Zellerfeld
Clausthal-Zellerfeld
Clausthal-Zellerfeld is a town in Lower Saxony, Germany. It is located in the southwestern part of the Harz mountains. Its population is approximately 15,000, Clausthal-Zellerfeld is also the seat of the Samtgemeinde Oberharz....

 (D)
St. Salvatoris III/P 55 case; today II/P/29
1700–02 Groningen (NL) Der Aa-kerk
Der Aa-kerk
The Der Aa-kerk is the second Middle Ages church building in the city center of Groningen, The Netherlands .- History :...

III/P 32 case, prospect, ca. 13 stops, 10 old stops reused by Schnitger; today III/P/40
1702 Estebrügge (D) St. Martin II/P 34 case
1704 Eenum
Loppersum
Loppersum is a municipality and a town in the northeastern Netherlands in the province of Groningen.- Population centres :Eekwerd, Eekwerderdraai, Eenum, Fraamklap, Garrelsweer, Garsthuizen, Hoeksmeer, Honderd, Huizinge, Kolhol, Leermens, Loppersum, Lutjerijp, Lutjewijtwerd, Merum, Middelstum,...

 (NL)
Hervormde Kerk I 10 case, prospect, 4-6 stops; today I/p/10
1704 Godlinze
Godlinze
Godlinze is a town in the Dutch province of Groningen. It is a part of the municipality of Delfzijl, and lies about 24 km northeast of Groningen.In 2001, the town of Godlinze had 133 inhabitants...

 (NL)
Hervormde Kerk II/p (?) 16 case, prospect, 8-9 stops; today I/p/12
1705 Accum
Schortens
Schortens is a town in the district of Friesland in Lower Saxony, Germany.-Division of the town:The town consists of the following parts: Schortens, Heidmühle, Grafschaft, Accum, Sillenstede, Schoost, Roffhausen, Middelsfähr, Addernhausen, Oestringfelde, Ostiem and Upjever.-History:The first traces...

 (D)
St. Willehad II/p 14 case
1707–08 Lenzen
Lenzen
Lenzen is a small town in the district of Prignitz, in Brandenburg, Germany. It is part of the Amt Lenzen-Elbtalaue.-Overview:Lenzen is situated near the Elbe, approx. 20 km northwest of Wittenberge. It was the scene of an early victory by the Germans over the Wends in 929...

 (D)
St. Katharinen II/P 27 case partly, 2-3 stops
1707–08 Hamburg
Hamburg
-History:The first historic name for the city was, according to Claudius Ptolemy's reports, Treva.But the city takes its modern name, Hamburg, from the first permanent building on the site, a castle whose construction was ordered by the Emperor Charlemagne in AD 808...

-Ochsenwerder (D)
St. Pankratius II/P 30 case, prospect, 5-11 stops; today II/P/24
1709–10 Weener
Weener
Weener is a town in the district of Leer, in Lower Saxony, Germany. It is situated near the border with the Netherlands, on the river Ems, approx. 10 km southwest of Leer, and 25 km southeast of Emden...

 (D)
St.-Georg II/p 22 case, 6 stops; today II/P/29
1710–11 Pellworm
Pellworm
Pellworm is one of the North Frisian Islands on the North Sea coast of Germany. It is part of the Nordfriesland district in the federal state of Schleswig-Holstein. Its area is 37 km², and its population is roughly 1,200....

 (D)
Old Church II/P 24 case, 11 stops (complete or partly)
1710–11 Sneek
Sneek
Sneek is a city southwest of Leeuwarden and seat of the former municipality of Sneek in the province of Friesland . As for 2011 it is part of the municipality Súdwest Fryslân...

 (NL)
Grote of Martinikerk III/P 36 case, prospect, 10 stops (complete or partly)
1711 Ferwert
Ferwert
Ferwert is a small village in Ferwerderadiel in the province Friesland of the Netherlands and has around 1900 citizens....

 (NL)
Hervormde Kerk II/P 26 5 stops
1710–13 Abbehausen
Nordenham
Nordenham is a town in the Wesermarsch district, in Lower Saxony, Germany. It is located at the mouth of the Weser river on the Butjadingen peninsula on the coast of the North Sea. The seaport city of Bremerhaven is located on the other side of the river...

 (D)
St. Laurentius II/P 24 case, prospect, 2 stops
1714–16 Rendsburg
Rendsburg
Rendsburg is a town on the River Eider and the Kiel Canal in the northeastern part of Schleswig-Holstein, Germany. It is the capital of the Kreis of Rendsburg-Eckernförde. As of 2006, it had a population of 28,476.-History:...

 (D)
Christuskirche II/P 29 case, 4 stops; today IV/P/51
1715–19 Itzehoe
Itzehoe
Itzehoe is a town in the German state of Schleswig-Holstein.As the capital of the district Steinburg, Itzehoe is located on the Stör, a navigable tributary of the Elbe, 51 km northwest of Hamburg and 24 km north of Glückstadt...

 (D)
St. Laurentii IV/P 43 case, prospect; today IV/P/58
1719–21 Zwolle
Zwolle
Zwolle is a municipality and the capital city of the province of Overijssel, Netherlands, 120 kilometers northeast of Amsterdam. Zwolle has about 120,000 citizens.-History:...

 (NL)
Grote of Sint-Michaëlskerk IV/P 64 case, main part of the stops; finished by the sons Franz Caspar Schnitger and Johann Georg Schnitger

See also

  • Pipe organ
    Pipe organ
    The pipe organ is a musical instrument that produces sound by driving pressurized air through pipes selected via a keyboard. Because each organ pipe produces a single pitch, the pipes are provided in sets called ranks, each of which has a common timbre and volume throughout the keyboard compass...

  • Johann Sebastian Bach
    Johann Sebastian Bach
    Johann Sebastian Bach was a German composer, organist, harpsichordist, violist, and violinist whose sacred and secular works for choir, orchestra, and solo instruments drew together the strands of the Baroque period and brought it to its ultimate maturity...

  • Dieterich Buxtehude
    Dieterich Buxtehude
    Dieterich Buxtehude was a German-Danish organist and composer of the Baroque period. His organ works represent a central part of the standard organ repertoire and are frequently performed at recitals and in church services...

  • North German Organ School

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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