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";s:4:"text";s:29384:"Tropical Depression 10 from 2004 is shown in the image. Across all the three provinces, homes were partially or completely destroyed, families. Heavy rainfall from a cyclone is usually spread over wide area and cause large scale, Apart from these Cyclones also create destructions such as. Wind speed can reach 32 m s-1 (about 120 km/h) in a Tropical Storm. This site uses cookies to enhance your user experience. For large weather systems, the circulation pattern is in a counterclockwise direction in the Northern Hemisphere and a clockwise direction in the Southern Hemisphere. IMD issued cyclone warnings off the coast of Tamil Nadu, Pondicherry and Sri Lanka. The wind blows increasingly strong, collecting moisture and heat from the ocean surface, which feeds the storm updrafts, warms the atmosphere, reduces surface pressure and intensifies the vortex. Cyclone Nivar : A cyclone is a general term for a weather system in which winds rotate inwardly to an area of low atmospheric pressure. Forecasting the formation of tropical cyclones relies on early identification of these pre-existing disturbances and then recognising which ones will amplify into full-blown cyclones. Nivar, currently over southwest Bay of Bengal, is moving west-northwestward at a speed of 11kmph. However, it was an intense category five hurricane with maximum sustained windspeeds of 141 miles per hour and gusts up to 169 miles per hour. While rains are expected in southern Andhra Pradesh, a deep depression is brewing over the Bay of Bengal and is most likely to turn into a severe cyclonic storm by Tuesday and cross the coast on Wednesday, according to the Indian Meteorological Department (IMD). There are three elements associated with cyclones that cause destruction during its occurrence. Meteorological phenomena Whether you need help solving quadratic equations, inspiration for the upcoming science fair or the latest update on a major storm, Sciencing is here to help. Each year, 80 to 90 tropical storms occur during the summer and early fall, about half of which develop into cyclones. [4] During a review meeting, Former Chief Minister of Tamil Nadu, K. Palaniswami asked his cabinet members and officials to remain completely vigilant and take necessary precautions ahead of the Cyclone. Cyclone Nivar has caused devastation, injuries and fatalities after making landfall in southern India where torrential rainfall has lashed coastal areas of the union territory of Puducherry and Tamil Nadu state. The eye has a diameter of from 20-60 km of light winds and looks like a black hole or dot surrounded by white clouds. * Debbie (1982) had been the last major hurricane to affect Canadian waters before the arrival of Alex, more than 20 years later. Subsequently, Cyclone Nivar weakened into a cyclonic storm and further into a deep depression, centered about 50 km west-southwest of Tirupati. There are 5 classes of hurricanes on the Saffir-Simpson hurricane scale. The development of tropical cyclones is a complex process and is still the subject of much research. Tropical cyclone formation is influenced by many factors, but the role of warm sea-surface temperatures as the primary source of energy for cyclones is paramountxxvii. In contrast to the light wind conditions in the eye, the turbulent cloud formation extending outwards from the eye accompany winds of up to 250 kmph, sufficient to destroy or severely damage most non-engineered structures in the affected communities. The storm has been named Cyclone Nivar, based on the guidelines of the World Meteorological Organisation (WMO). [Source: NRL Monterey Marine Meteorology Division http://www.nrlmry.navy.mil/TC.html]In relation to such processes, or as a result of external influences such as atmospheric variations in pressure, wind or humidity, the presence of cold or hot ocean currents or eddies, tropical cyclones are subject to more or less rapid changes in intensity. But why does an eye form? Met Office: Development of Tropical Cyclones. The Saffir-Simpson Hurricane Scale is a five-point rating scale used to describe a hurricane's present intensity. We are the learned society for geography and geographers. When thunderstorm developments are intense, almost all of the moist air flow from the periphery is carried away in strong updrafts, the compensating downward movement in the eye is strong and causes very strong heating and drying, the central pressure is low and the eye appears clearly on satellite images. Following four atmospheric and oceanic conditions are necessary for development of a cyclonic storm. : U80904DL2018PTC338126 | GST No. [Source: http://www.atmos.umd.edu/~stevenb/hurr/]The Eye of the cyclone is a clear and dry area at medium and high altitude, often loaded with clouds in the lower layers where the air is almost saturated with moisture. For the storm clouds to turn into a cyclone, wind shear, the speed at which high-level winds blow clouds away, must be low. (with the Institute of British Geographers), You must be a member holding a valid Society membershipto view the content you are trying to access. Molecular Biology and Genetics, National Weather Service: Tropical Cyclone Structure. Officials were also directed to ensure that people in vulnerable areas were evacuated. Universit Pierre et Marie Curie, Paris, https://www.encyclopedie-environnement.org/en/air-en/tropical-cyclones-development-and-organization/. Winds in the eye of the storm are calm, typically up to 15 miles per hour, and there is no rain here because cool air sinks in the eye. [1] Clockwise rotation movement in the southern hemisphere, counter-clockwise in the northern hemisphere. [3], On 24 November, six National Disaster Response Force (NDRF) teams have been posted to Cuddalore and two teams will be deployed in Chennai. PGDM; Specialisations. The central depression partially fills in and the cloud-filled eye is less clearly visible from space. [15] Five people were reported dead in Tamil Nadu. The thick storm clouds that surround the eye of the storm are called the eyewall. Left: light eye of Hurricane Rita, in Category 5 on September 22, 2005 at 12:18 UTC; right: cloudy eye of the same hurricane in Category 3 on September 23 at 23:16 UTC. Therefore, there are different stages of a tropical cyclone and they are: Tropical disturbance, London, SW7 2AR. A hurricane's sustained wind speed determines a hurricane's category.This helps estimate potential property damage along a hurricane's path. After making landfallat around 10.30 pm on 25 November,cyclone Nivarweakenedfrom very severetoonly a severe cyclonic storm and movednorthwardsinland. The different stages of the development of a tropical cyclone includes: This refers to rapid storms which propagate in a circular manner that has a low pressure center and is associated with strong, violent winds and can cause massive devastation. Why can category 1 tropical cyclones be more destructive (damaging) than category 5 tropical cyclones Paragraph 2: IMPACT How did the tropical cyclone impact the following? They also facilitate new stormy developments that can strengthen them. This is zero on the equator itself and only becomes large enough to generate rotation within a weather system poleward of 5 of latitude. El Nio is an excellent example of the coupling between tropical rainfall amounts and ocean temperatures. Copy. The return to the surface is accomplished with the downward flow that predominates at large distance. Sometimes, the eye disappears as it approaches the island, and reappears a few hours later, several tens of kilometres in the wake of the obstacle. In the year 1875, the Government of India established the India Meteorological Department, bringing all meteorological work in the country under a central authority. Interannual variability is quite high in each basin, but fluctuations in opposite directions between different oceans generally compensate for local variations. IMD is the principal agency for all matters relating to meteorology and allied subjects such as weather forecasting and seismology etc. In this region the winds increase uniformly in speed toward the centre. The first phase is the formation of the tropical cyclone, and numerous factors can lead to this, such as low pressure coinciding with convective clouds. Thankfully cyclones are rather inefficient engines, converting less than 10% of the available heat energy from condensation in the clouds into the mechanical energy of the motion of the winds. discuss the stage of development of the tropical cyclone nivar. Cyclones rely on the development of tall columns of convective cloud which extend of the order of 10 km in the vertical. This cycle continues, making cloud columns spin faster and wind speeds increase. The forced lifting of hot and humid air on the windward side of the mountains causes a local reinforcement of the sometimes very heavy rains, leading tofloods and landslides with often dramatic consequences. Tropical Cyclone Eloise made landfall in Mozambique on Saturday, with the outer bands of the storm sweeping across South Africa, Zimbabwe and Eswatini. The coupling between primary and secondary circulations implies that the Eyewall cannot be stable. Even if the surface waters are very warm, the strong winds in a developing cyclone cause mixing of the surface layer of the ocean, bringing water up from below the surface. You can unlock new opportunities with unlimited access to hundreds of online short courses for a year by subscribing to our Unlimited package. While the winds may be tame in comparison with a hurricane, rainfalls of 100-200 mm are not uncommon. What is a Tropical Cyclone? As well as large wind shear, a dry atmosphere can also act to prevent deep columns of cloud forming. [18] In Nellore district, Paddy seedlings in 2500 hectares drowned and in Prakasam district, standing crops in 34,000 hectares were damaged. The tropical oceanic atmosphere is generally close to neutrality, which does not allow the development of large-scale upward movements. Around 2,000 people were evacuated in Puducherry alone. Wind speed can reach 32 m s-1 (about 120 km/h) in a "Tropical Storm". Be part of our community by following us on our social media accounts. There are four stages of tropical cyclones, which are tropical disturbance, tropical depression, tropical storm and hurricane or typhoon. They are largely deployed for floods, cyclones, building collapse and earthquakes in India. houseboat netherlands / brigada pagbasa 2021 memo region 5 / discuss the stage of development of the tropical cyclone nivar. The storm displaced more than 16,000 people, damaged around 17,000 houses, and killed more than a dozen people across a few countries in southeast Africa. Tropical cyclones form only over warm ocean waters near the equator. This was later rescindedby 26 November. Context: The Bay of Bengal will see its second Severe Cyclone of the year, after Super Cyclone Amphan formed earlier this year. This inrushing air near the surface results in strong winds which increase the evaporation from the ocean surface. It is not subject to the Government of Canada Web Standards and has not been altered or updated since it was archived. 1/18/21 it grew to a strong tropical storm with winds to 60 mph. Can you replicate the colour coded data? "Global Catastrophe Recap in November 2020", "Update on Cyclone Gati and Depression BOB 04", "India, Sri Lanka Tropical cyclone NIVAR (GDACS, JTWC, IMD, Department of Meteorology Sri Lanka) (ECHO Daily Flash of 24 November 2020)", "Cyclone Nivar live | TN deputes 10 top police officers to monitor rescue and relief works", "Trains and buses cancelled, NDRF teams on alert: Here's how Tamil Nadu is bracing for Cyclone Nivar", "Cyclone Nivar: PM Modi Assures Complete Support to TN, Puducherry", "Nivar: Possible flight disruption to statewide holiday in TN 10 updates", "Over 1 lakh people evacuated in Tamil Nadu & Puducherry as cyclone Nivar intensifies", "1 Dead, Thousands Evacuated As Cyclone Nivar Brings Heavy Rain In Andhra", "Cyclone Nivar: IMD issues yellow alert in Karnataka", "Cyclone Nivar: Chennai Corporation evacuates 478 residents from low-lying areas", "Gates of Chembarambakkam reservoir opened after 5 years", "Inundation plagues residents in and around city suburbs", "Cyclone Nivar: Chennai Corporation clears 223 roads of uprooted trees, restores traffic", "Cyclone Nivar impact: Heavy rains batter Pondicherry, trees uprooted", "Tentative Loss Of Rs 400 Crore Due To Cyclone Nivar: Puducherry Chief Minister", "Cyclone Nivar claims eight lives in Andhra Pradesh", "Cyclone Nivar | Three killed, crops damaged as storm crosses Tamil Nadu coast", "Nivar causes a loss of 5.07 crore to SPDCL", https://en.wikipedia.org/w/index.php?title=Cyclone_Nivar&oldid=1075064428, Short description is different from Wikidata, Wikipedia articles in need of updating from November 2020, All Wikipedia articles in need of updating, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 3 March 2022, at 18:15. Can you chart the course of cyclone Nivar? Nivar will be the second cyclone to hit Tamil Nadu in two years after Cyclone Gaja in 2018. Looking down upon them from space, tropical storms look like a gigantic whirlpool of clouds. Sometimes, gaps between the rainbands leave areas within the storm with no rain or wind. Please contact us to request a format other than those available. All convective storms need unimpeded vertical flow. The red arrows indicate where cool air is sinking. Meteorologists have divided the development of a tropical cyclone into four stages: Tropical disturbance, tropical depression, tropical storm, and full-fledged tropical cyclone. The rainfalls made significant impact on the districts of Chittoor, Prakasam, Kadapa and Nellore, 112000 people were affected, 2,294 houses/huts were damaged, 6,133 homes were left stranded, 2,618 small animals, 88 large animals and 8,130 poultry birds were reported dead based on a preliminary evaluation. [10], Showers and thunderstorms associated with Nivar impacted parts of Sri Lanka as the system moved inland on November 26.[11]. The progression of tropical disturbances can A cyclone is the same as a hurricaneor typhoon. Learn more about how FutureLearn is transforming access to education. Eloise is the seventh tropical depression fourth named storm, and third severe tropical storm of the 2020-2021 South West Indian Ocean Cyclone Season. Please login to continue. Cyclones and other natural disasters that affect India and the world are important topics for the UPSC exam. As thunderstorm cells develop, a large warm anomaly forms at altitude in the central part of the cluster. Before becoming a freelance writer, Adrianne worked for many years as a Marine Aquaculture Research Technician with Plant & Food Research in New Zealand. A cyclone is a tropical stormthat forms in the Indian Ocean. For example, during Hurricane Juan (2003), the scale was not very helpful because the winds were marginal Category 2 strength yet the damage to trees was at the Category 3 level. According to the India Meteorological Department (IMD), Cyclone Nivar, which crossed the TN coast as a very severe cyclonic storm with wind speeds of 120 kmph and rain-filled, further weakened as it moved inland. The spatiotemporal distributions and physical-optical properties of aerosols are of great scientific significance for the study of climate change and atmospheric environment. The Pacific Northwest with 25 depressions and storms, and 15 typhoons, accounts for nearly a third of the world total. [2] Vertical variation in wind speed or direction. An increase in vertical wind shear can also bring about the decay of a tropical cyclone. Very Severe Cyclonic Storm Nivar was a tropical cyclone which brought severe impacts to portions of Tamil Nadu and Andhra Pradesh in late November 2020. Privacy Policy 8. You can read FutureLearn's Cookie policy here. A hurricane is a tropical cyclone. . Afterwards the system entered back into the Bay of Bengal as a Deep Depression and made second and final landfall at Andhra Pradesh coast on the same day. These phenomena have different names depending on their intensity, measured by the strength of the surface wind. A cyclone is taking shape in the North Indian Ocean region. Prohibited Content 3. A Tropical Wave becomes a Tropical Depression when there is a presence of a closed circulation or rotation and sustained winds of 25 mph. [12] Due to intense rainfall, Chembarambakkam Lake released water for the first time after five years. Canadian Environmental Protection Act (CEPA) Environmental Registry, Ministerial and Governor-in-Council appointments. The NDRF is a disaster-response agency in India. [3] Pseudo-force directed perpendicular to the direction of movement of a moving body in a uniformly rotating environment. In the North Atlantic Ocean and the Caribbean Sea, this weather pattern is called a hurricane. An eye will usually develop when the maximum sustained wind speeds go above 74 mph (119 km/h) and is the calmest part of the storm. In the peripheral zone, hundreds of kilometres beyond the core, the horizontal flow is less symmetrical and the radial component of the wind is proportionally larger. The wind field of a tropical cyclone may be divided into three regions. what challenge do they face? Take a look at our IAS Toppers, Polity | Environment | Economy | IFoS Preparation Guide | Crack IAS in first Attempt | Interview Preparation Guide, #Delhi - 19, Pusa Road, 2nd Floor, IAPL House, Opposite Metro Pillar 95-96, Karol Bagh, New Delhi-110005, View Google Map Location, #Patna - 2nd floor, AG Palace, E Boring Canal Rd, Patna, Bihar 800001, View Google Map Location, #Hyderabad - 1st Floor, SM Plaza, RTC X Rd, Indira Park Road, Jawahar Nagar, Hyderabad, Telangana 500020, View Google Map Location, CIN No. Figure 6. The northern hemisphere is by far the largest, due to the absence of cyclones over the South Atlantic and South-East Pacific, where the ocean is not warm enough. All types of tropical storms form in the same way, starting with a tropical disturbance. Air At the same time, the colder air pockets brought by downdrafts into the lower layers of the atmosphere must disappear. These intense rainbands move towards the eyewall and take on its moisture and momentum, ultimately weakening the entire cyclone or replacing the inner eyewall and enabling the storm to continue or become stronger. The northern Indian Ocean accounts for only 5% of the world total, but due to the shallow depth of the Bay of Bengal, low coastal elevations and high population densities, they often cause considerable damage. The Bay of Bengal hosts only 4% of thetotal tropical cyclonesglobally butsuffersof the fatalities arefrom this region. Explanation: My opinion based on the work I have done is that I have learned that a Tropical cyclone can damage your life severely but overtime it will get better, and it can be formed from a simple thunderstorm then gradually draw more energy to itself to attain the name Tropical Cyclone a deadly natural disaster/hazard like bushfires or floods. All of the systems described here have emphasised the greater intensity of the weather patterns in the Tropics which is a response to the large amounts of energy received from the Sun at tropical latitudes. Accessibility In simple terms, a cyclone acts like an engine. Many factories, offices and commercial establishments remained closed in and around Chennai on Thursday as the very severe cyclonic storm Nivar, crossed the Tamil Nadu and Puducherry coasts. To cite this article: ROUX Frank (July 16, 2019), Tropical Cyclones: development and organization, Encyclopedia of the Environment, Accessed March 4, 2023 [online ISSN 2555-0950] url : https://www.encyclopedie-environnement.org/en/air-en/tropical-cyclones-development-and-organization/. OK. Cyclone Nivar: Path. When cyclonic circulation is sufficiently developed with a strong surface depression, a weak downdraft is established at the centre of the disturbance. Before publishing your articles on this site, please read the following pages: 1. Adrianne Elizabeth is a freelance writer and editor. The second extract, by friction on the ocean surface, energy in the form of moisture, used to maintain rising currents via the heat released during condensation. [2], Red warnings were put in place for northern Sri Lanka, with the threat of heavy rainfall in the region. Although Tropical cyclones are known for the destruction they cause, when they strike, they also bestow certain benefits to the climatic conditions of that area such as. Tropical Disturbance Whilst intense storms are very common throughout the Tropics, tropical cyclones need a very specific set of ingredients in order to form. On this Wikipedia the language links are at the top of the page across from the article title. At ForumIAS, we have a dream. In terms of the life cycle of a tropical cyclone, which on average lasts for nine days, it passes through four phases as well. The carbon and water cycles, climate and change. Category 1 and 2 storms are still dangerous, however . On the night of 25 November, at 11.30pm, cyclone Nivar began its landfall at Puducherry on the Tamil Nadu coast. Vacancies The Bay of Bengal will see its second Severe Cyclone of the year, after Super Cyclone Amphan formed in May. When the cyclone hits land, especially over mountainous or hilly terrain, riverine and flash flooding may last for weeks. The cyclonic Primary Circulation that circulates around the eye is much more intense than the radial (which goes from the outside to the inside, and vice versa) and vertical Secondary Circulation. Development of all tropical systems is dependent on the ability to create vertical flow over 10's of thousands of feet in altitude. As this air moves up and away from the ocean surface, it leaves is less air near the surface. . [5] Measures were taken by the Tamil Nadu government to store dry rations and fuel for the people after the cyclone's impact. Tropical Disturbance INVEST 99S that spawned Eloise was first noted on 14 January as it entered a region marginally favourable to development. Tamil Nadu government suspended bus services until further orders in seven districts of Thiruvarur, Nagapattinam, Pudukkottai, Thanjavur, Viluppuram, Chengalpattu and Cuddalore. Wind speed is the determining factor in the scale, as storm surge values are highly dependent on the slope of the continental shelf and the shape of the coastline in the landfall region. discuss the stage of development of the tropical cyclone nivar. When an area of disturbed weather in the tropics causes a moving area of thunderstorms, everyone pays a bit closer attention. Information identified as archived is provided for reference, research or recordkeeping purposes. The hurricane's center is a relatively calm, generally clear area of sinking air and light winds that usually do not exceed 15 mph (24 km/h) and is typically 20-40 miles (32-64 km) across. Finally, 10 depressions and storms, and 5 cyclones occur annually over the southwest Pacific. It particularly effectedChennai inTamil Nadu andAndhra Pradeshfurther up the coast. The stronger wind at this location increases surface friction and moisture input, which shifts the Eyewall inward. The Encyclopedia of the Environment by the Association des Encyclopdies de l'Environnement et de l'nergie (www.a3e.fr), contractually linked to the University of Grenoble Alpes and Grenoble INP, and sponsored by the French Academy of Sciences. Such circulations may persist long after the deep convective clouds that produced them have dissipated. Above the oceans just north and south of the equator, a weather phenomenon called a tropical cyclone can develop that can drastically alter the physical and cultural landscape if it reaches land. Now we have a La Nina in the Pacific, that is cool conditions in the Pacific that makes the local environmental conditions favourable for cyclogenesis in the Bay of Bengal. The stages of development of the tropical cyclone nivar include the following: Tropical disturbance Tropical depression Tropical storm Full-fledged tropical cyclone. Under less favourable conditions, a larger proportion of the wet flow in the lower layers penetrates into the eye, moistens and cools it. Shifts in the pattern of temperatures in the equatorial Pacific Ocean lead to very large changes in weather patterns, not just in the tropical Pacific but right around the world. Trees were uprooted, electric poles were damaged and several areas were flooded as of November 26. All types of tropical storms with wind speeds above 74 miles per hour are cyclones. This deep cloud often forms an almost circular ring called the eyewall around the very centre of the storm which is itself free from clouds. Little change in strength is forecast until the low moves into the western Atlantic by early Wednesday. FutureLearn uses cookies to enhance your experience of the website. The southeast quarter is favoured in the northern hemisphere, the northeast one in the southern hemisphere. Long bands of precipitation, locally intense and a few tens of kilometres wide, extend mainly eastward in the convergence zone between cyclonic circulation and the easterly trade winds that prevail in the tropics. The storm is now given a name. As the system develops the Earths rotation acts on the inrushing winds, deflecting them into a pattern that rotates about the centre of the storm, spiralling in towards the centre. Stages of Development: from tropical depression to hurricane Stages of Development from tropical depression to hurricane Hurricanesevolve through a life cycle of stages from birth to death. Usually the majority of deaths occur, not whilst the system is actively affecting a region which may be for periods of less than a day, but in the aftermath as flooding and damage to the local infrastructure lead to disease, drowning and lack of a clean water supply. Explanation: Tropical disturbance, tropical depression, tropical storm, and full-fledged tropical cyclone. On November 25, 2020, severe. The, The administrative responsibilities of the Department are under the supervision of the. Blog Home Uncategorized discuss the stage of development of the tropical cyclone nivar. PRIVACY NOTICE The largest losses of human life due to weather events are also associated with these systems, with death tolls sometimes into the 100s and even 1000s. This storm never strengthened beyond the tropical depression stage. The two main categories of cyclones are tropical (forming in the tropics) and extra-tropical (forming outside of the tropics). Their distribution shows a first maximum in May June and another secondary in October November. Content Guidelines 2. Disclaimer 9. Occasionally during strong tropical storms the rainbands form their own strong thunderstorms. The strong coupling between the warmest ocean surface temperatures and heaviest rainfall rates is a striking feature of the tropical climate. The development of cycle of tropical cyclones may be divided into three stages. Very Severe Cyclonic Storm Nivar was a tropical cyclone which brought severe impacts to portions of Tamil Nadu and Andhra Pradesh in late November 2020. All types of tropical storms require four conditions to form. Tropical cyclonesvariously defined as hurricanes, typhoons, and cyclonesregularly impact human populations and periodically produce devastating weather-related natural disasters. The Core is the region, a few hundred kilometres wide, where the air follows closed trajectories around the low pressure centre. Shown here is Alex, as a tropical storm on both August 1 and August 2, 2004. Heat energy releases from the cooling water vapor, making the top-level clouds warmer and increasing the air pressure, shifting winds outward from the center. Lots of moisture through the depth of the atmosphere. When those wind speeds reach between 25 and 39 miles per hour, tropical or cyclone depressions form. Upper divergence above the sea level system. You can specify conditions of storing and accessing cookies in your browser, DISCUSS THE STAGES OF DEVELOPMENT OF THE TROPICAL CYCLONE NIVAR. Their organization, highlighted in the above photograph taken from the International Space Station (Hurricane Katrina, August 2005), is influenced by aninterplay between dynamics and thermodynamics. The Hindustan Timesreported that independent scientists said warming of oceans due to climate change was leading to more intense cyclones and dangerous storm surges in the Bay of Bengal. Tropical waves, or easterly waves, move westward across the tropical Atlantic under the easterly trade winds. In early autumn, old Caribbean hurricanes may turn into mid-latitude storms on the west coast of Europe a few days later. In the North Pacific Ocean, the same type of weather . The scale proposed in 1977 by the Americans H.S. Development of tropical cyclones Tropical cyclones develop in tropical oceans at least 5 - 30 latitude north or south of the equator, where the sea temperature is at least 27 C.. 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