paragraph_text: The PIN Code system was introduced on 15 August 1972 by Shriram Bhikaji Velankar, an additional secretary in the Union Ministry of Communications. The system was introduced to simplify the manual sorting and delivery of mail by eliminating confusion over incorrect addresses, similar place names and different languages used by the public.

paragraph_text: The differences between fungi and other organisms regarded as plants had long been recognised by some; Haeckel had moved the fungi out of Plantae into Protista after his original classification, but was largely ignored in this separation by scientists of his time. Robert Whittaker recognized an additional kingdom for the Fungi. The resulting five - kingdom system, proposed in 1969 by Whittaker, has become a popular standard and with some refinement is still used in many works and forms the basis for new multi-kingdom systems. It is based mainly upon differences in nutrition; his Plantae were mostly multicellular autotrophs, his Animalia multicellular heterotrophs, and his Fungi multicellular saprotrophs. The remaining two kingdoms, Protista and Monera, included unicellular and simple cellular colonies. The five kingdom system may be combined with the two empire system:

paragraph_text: Evangelische Omroep (EO, English: "Evangelical Broadcasting") is one of the twelve member-based broadcasting associations contributing to the Netherlands Public Broadcasting system. It has as its mission to bring people into contact with Jesus Christ and its statement of faith is a form of Evangelicalism. EO is one of the few broadcasting associations in the "pillarized" Dutch broadcasting system to have remained totally faithful to its religious roots. For a long time every one of its programmes made reference to God and to the Christian religion, although this is less often the case in the 21st century.

paragraph_text: Köppen - Geiger climate classification system classifies its climate as hot desert (BWh). Luxor, Minya, Sohag, Qena and Asyut have the widest difference of temperatures between days and nights of any city in Egypt, with almost 16 ° C (29 ° F) difference. Sohag is one of the warmest places in Egypt due to its place in the east side of Sahara in North Africa. Sohag is ranked the 5th driest place in Egypt and the 9th globally. Also ranked 4th warmest place in Egypt and 296th globally.

paragraph_text: The two systems were to run on a trial basis for six months; early television sets supported both resolutions. However, the Baird system, which used a mechanical camera for filmed programming and Farnsworth image dissector cameras for live programming, proved too cumbersome and visually inferior, and ended with closedown (at 22:00) on Saturday 13 February 1937.

paragraph_text: Savage Inequalities: Children in America's Schools is a book written by Jonathan Kozol in 1991 that discusses the disparities in education between schools of different classes and races. It is based on his observations of various classrooms in the public school systems of East St. Louis, Chicago, New York City, Camden, Cincinnati, and Washington D.C.. His observations take place in both schools with the lowest per capita spending on students and the highest, ranging from just over $3,000 in Camden, New Jersey to a maximum expenditure of up to $15,000 in Great Neck, Long Island.

paragraph_text: In 2018, the Social Security Wage Base was $128,400 and the Social Security tax rate was 6.20% paid by the employee and 6.20% paid by the employer. A person with $10,000 of gross income had $620.00 withheld as Social Security tax from his check and the employer sent an additional $620.00. A person with $130,000 of gross income in 2017 incurred Social Security tax of $7,886.40 (resulting in an effective rate of approximately 6.07% - the rate was lower because the income was more than the 2017 ``wage base '', see below), with $7,886.40 paid by the employer. A person who earned a million dollars in wages paid the same $7,886.40 in Social Security tax (resulting in an effective rate of approximately 0.79%), with equivalent employer matching. In the cases of the $130 k and $1 m earners, each paid the same amount into the social security system, and both will take the same out of the social security system.

paragraph_text: The first television broadcast in Australia took place on 30 September 1929 at the Menzies Hotel in Melbourne, using the electro - mechanical Radiovision system. Other transmissions took place in the city over the next few weeks. Also in 1929, the Baird system was used on 3DB, 3UZ and 2UE.

paragraph_text: The Obusier de 6 pouces Gribeauval or 6-inch howitzer was a French artillery piece and part of a system established by Jean Baptiste Vaquette de Gribeauval. The Old French inch () was actually 1.066 English inches long so the weapon can accurately be described as a 6.4-inch howitzer. The Gribeauval system included the 6-inch howitzer, the light Canon de 4 Gribeauval, medium Canon de 8 Gribeauval and the heavy Canon de 12 Gribeauval. Superseding the older Vallière system, the Gribeauval system was introduced in 1765 and the guns were first used during the American Revolutionary War. The most comprehensive employment of Gribeauval guns occurred during the French Revolutionary Wars and the Napoleonic Wars. Two 6-inch howitzers were often added to four or six cannons to make up a battery of artillery in Napoleon's armies. The 6-inch howitzer was capable of firing an exploding shell at long-range targets or a canister shot at close-range enemy personnel. Starting in 1803, the Year XI system partly replaced the Gribeauval artillery, but it was not until 1829 that the Gribeauval system was wholly superseded by the Valée system.

paragraph_text: The BBC began its own regular television programming from the basement of Broadcasting House, London, on 22 August 1932. The studio moved to larger quarters in 16 Portland Place, London, in February 1934, and continued broadcasting the 30-line images, carried by telephone line to the medium wave transmitter at Brookmans Park, until 11 September 1935, by which time advances in all-electronic television systems made the electromechanical broadcasts obsolete.

paragraph_text: The flag of the United States of America, often referred to as the American flag, is the national flag of the United States. It consists of thirteen equal horizontal stripes of red (top and bottom) alternating with white, with a blue rectangle in the canton (referred to specifically as the ``union '') bearing fifty small, white, five - pointed stars arranged in nine offset horizontal rows, where rows of six stars (top and bottom) alternate with rows of five stars. The 50 stars on the flag represent the 50 states of the United States of America, and the 13 stripes represent the thirteen British colonies that declared independence from the Kingdom of Great Britain, and became the first states in the U.S. Nicknames for the flag include the Stars and Stripes, Old Glory, and the Star - Spangled Banner.

paragraph_text: The Los Gatos Rowing Club was started in 1979 to provide what was then mostly an eastern U.S. sport, to the kids in the Santa Clara Valley. In the past 20 years, more than 2,000 kids from 15 different high schools have passed through the program. Many have gone onto colleges and universities to row competitively, several have received rowing scholarships, and a few have been selected for Junior National Camps and are trying for the Olympics.

paragraph_text: The basis for classical economics forms Adam Smith's An Inquiry into the Nature and Causes of the Wealth of Nations, published in 1776. Smith criticized mercantilism, advocating a system of free trade with division of labour. He postulated an "invisible hand" that regulated economic systems made up of actors guided only by self-interest. Karl Marx developed an alternative economic theory, called Marxian economics. Marxian economics is based on the labor theory of value and assumes the value of good to be based on the amount of labor required to produce it. Under this assumption, capitalism was based on employers not paying the full value of workers labor to create profit. The Austrian school responded to Marxian economics by viewing entrepreneurship as driving force of economic development. This replaced the labor theory of value by a system of supply and demand.

paragraph_text: While considered "alternative" today, most alternative systems have existed since ancient times. After the public school system was widely developed beginning in the 19th century, some parents found reasons to be discontented with the new system. Alternative education developed in part as a reaction to perceived limitations and failings of traditional education. A broad range of educational approaches emerged, including alternative schools, self learning, homeschooling and unschooling. Example alternative schools include Montessori schools, Waldorf schools (or Steiner schools), Friends schools, Sands School, Summerhill School, The Peepal Grove School, Sudbury Valley School, Krishnamurti schools, and open classroom schools. Charter schools are another example of alternative education, which have in the recent years grown in numbers in the US and gained greater importance in its public education system.

paragraph_text: Tolka Row was an Irish drama serial set in a fictional housing estate on the northside of Dublin. Based on Maura Laverty's play of the same name, "Tolka Row" was first broadcast on 3 January 1964 and aired weekly for five series until it ended on 31 May 1968.

paragraph_text: Cubis 2 is a puzzle video game that was released in 2004 by FreshGames. In "Cubis 2", the player shoots different colored cubes into cubes that are already placed on the isometric game table. Once three of the same color are matched in a row or are stacked, the cubes disappear and the player earns points. Once the board is clear or enough points are earned, the player advances to the next board which features a new animated backdrop.

paragraph_text: Raphael Rowe is an investigative journalist, best known for his work with "BBC Panorama". Rowe was convicted in 1990 of murder and a series of robberies as part of the M25 Three. After twelve years in prison, the convictions of Rowe and his two co-defendants, Michael George Davis and Randolph Egbert Johnson, were ruled "unsafe" in July 2000. They had lost their first appeal in 1993.

paragraph_text: After a series of test transmissions and special broadcasts that began in August, regular BBC television broadcasts officially resumed on 1 October 1936, from a converted wing of Alexandra Palace in London, which housed two studios, various scenery stores, make-up areas, dressing rooms, offices, and the transmitter itself, now broadcasting on the VHF band. BBC television initially used two systems, on alternate weeks: the 240-line Baird intermediate film system and the 405-line Marconi-EMI system, each making the BBC the world's first regular high-definition television service, broadcasting Monday to Saturday from 15:00 to 16:00 and 21:00 to 22:00.

paragraph_text: Melodifestivalen 1981 was the selection for the 21st song to represent Sweden at the Eurovision Song Contest. It was the 20th time that this system of picking a song had been used. 90 songs were submitted to SVT for the competition. The final was broadcast on TV1 but was not broadcast on radio. It was the second time that Lasse Holm and Kikki Danielsson had been beaten into second place by Björn Skifs, after 1978.

paragraph_text: The National Conference of State Legislatures held in Washington D.C. stated in a 2014 overview that many supporters for affirmative action argue that policies stemming from affirmative action help to open doors for historically excluded groups in workplace settings and higher education. Workplace diversity has become a business management concept in which employers actively seek to promote an inclusive workplace. By valuing diversity, employers have the capacity to create an environment in which there is a culture of respect for individual differences as well as the ability to draw in talent and ideas from all segments of the population. By creating this diverse workforce, these employers and companies gain a competitive advantage in an increasingly global economy. According to the U.S. Equal Employment Opportunity Commission, many private sector employers have concluded that a diverse workforce makes a "company stronger, more profitable, and a better place to work." Therefore, these diversity promoting policies are implemented for competitive reasons rather than as a response to discrimination, but have shown the value in having diversity.

Question: For how long did Raphael Rowe's place of employment alternate different broadcasting systems?
Answer: six months