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Are we making rational decisions in the rice sector?

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By M. P. Dhanapala

Agrochemicals, including chemical fertilisers, are to be replaced by non-toxic organic manure and other environmentally-friendly products, based on the expert advice that the modern agricultural products are toxic due to indiscriminate use of agrochemicals. An example frequently cited was the Chronic Kidney Disease (CKDu) of unknown origin in the North Central Province. Also, some critics insist that those who promote agrochemicals are rewarded by multinational companies involved in the agrochemical industry.

As a result, agrochemicals, in agriculture, have become a topic, debated in public media by policymakers, their advisors, specialist doctors, university professors, professionals of organic agriculture, scientists, politicians and leaders of farmer organisations. The above-mentioned allegations were refuted as inaccurate, inconclusive and unscientific (Pethiyagoda, R., YouTube seminar https://www.youtube.com/watch?v=rGe6ld2q1vs).

According to some scientists, the causal agent of CKDu was concluded as high concentration of Fluoride ion (Fl-) in drinking water. As a rice scientist, some issues bother me in this whole dispute; especially in the area of chemical fertiliser, the most indispensable, one and only input, that increases the productivity of crops.

Rice farming is the least remunerative of all occupations in Sri Lanka; the farmers in the past were involved in rice farming because of the social dignity, the pride of not consuming imported rice (Beven, 1914, Tropical Agriculturist, 1914 Dec.). Also, farming is considered an independent profession; the fact that one has to pay respect when dealing with the farming community.

Organic manure issue

Some critics insist that we have lost the organic manure technology practised 3000 years ago; probably a documentation failure. It would be great if we could recover the old technology from somewhere. However, in the recent past, as documented in the scientific journal ‘Tropical Agriculturist’, incorporation of bulk organic matter was recommended as early as 1914 for rice fields to circumvent disintegration and deterioration of soil structure, due to puddling during land preparation (Harrison, 1914). The nutritional status of the organic material concerned was not quantified or discussed. This recommendation was made during the British era, around the inception of the Department of Agriculture, and it is valid even today.

In the 1940s, farmers did cultivate traditional varieties with green manure, farmyard manure, compost, soybean cake and fishmeal, as organic manure but no specific recommendations were recorded. The targeted rice yield then was 15 bushels per acre (0.75 tons per hectare) but realised only a national average of less than 13 bushels per acre (< 0.65 t/ha). The government then had to import two-thirds of the rice requirement of the country to feed the population (Tropical Agriculturist, 1945 July – Sept.). The rice ration book continued till the modern varieties were developed and established. The present day advisors and policymakers may be unaware of or have ignored the rice ration book, each citizen had, with 52 weekly stamps, to obtain the imported (millcharred/white raw) rice ration from the nearby cooperative shop.

Incorporation of paddy straw into fields was emphasised, just before the turn of the Century, to sustain soil fertility and organic content of the soil, especially when the cropping intensity increased with the release of high potential short-duration rice varieties. This recommendation was complemented with site-specific soil test-based fertiliser recommendations, using the regional recommendations as guidelines, to prevent indiscriminate use of fertiliser. Also, the researchers were vigilant to keep the high organic soils with poor and impeded drainage (wet zone) devoid of organic manure while taking precautions to prevent straw or crop residue from becoming a primary inoculum of diseases.

Organic manure no doubt improves the physical, chemical and biological properties of the soil. Organic manure has colloids, composed of protein-rich material with negatively charged amino acids, and help to build up the soil structure and Cation Exchange Capacity (CEC) thus improving the nutrient retention power of the soil. Organic manures are not known as rich sources of plant nutrients. The nutrient contents and efficiency of different sources of organic manure are shown in Table 1.

The nutrient content of organic manure from the above-mentioned sources in Sri Lanka cannot be significantly different from values in Table 1, unless some other additives had been incorporated in the process of manufacture.

Now, let us consider the nutrient recommendation for the most popular group of rice varieties (3.5-month) grown under irrigation in the dry zone. The present recommendation per hectare is 105 kg Nitrogen (N), 25 kg Phosphorus (P2O5) and 35 kg of Potash (K2O) (Page 15, Fertilizer Recommendation for Rice, Department of Agriculture, 2013). As an example, we will examine the requirement of the most controversial nutrient component, nitrogen (N), in this recommendation. To meet this N requirement, the farmer should have around 13 tons of moisture-free compost (0.8 percent N) for one hectare of land, assuming that the harvested straw of the previous season is not incorporated into the soil. If the compost available has 20 percent moisture, this figure would be a little more than 16 tons. The farmer then will have to pay for and carry in the field a little more than three tons of water on his back for every hectare of rice land cultivated. Additionally, there are peak requirements of N at different growth stages of the crop to promote yield components of the plant. The compost, once applied, will release N consistently, irrespective of the peak requirements of the crop growth stages and may continue this process even beyond the lifespan of the crop as long as the mineralisation process continues. This example may be too much of an exaggeration, but the advisors, or policymakers, should know how inappropriate it is, to substitute a technology, more relevant for home gardening, for extensive paddy cultivation; this probably will be the reason behind the denial of compost culture by commercially-oriented rice cultivators. Besides, it is unethical to force on farmers, a new technology, unfamiliar to them altogether. Organic farming specialists can demonstrate, in large scale field trials, their intended package of practices, specifically in different agro-ecological regions, to ascertain its appropriateness; feasibility, economic viability, sustainability and other advantages, to convince and gain farmer acceptance. The total package of the proposed organic rice farming may include other options; green manure crops, vermicompost, biofilms, effective microbes, biogas residual products, N fixing microbes and organic extracts of unknown origin and ingredients, but none of these technologies were field-tested and demonstrated with modern rice varieties.

One good example of Inappropriate Technologies is the ‘System of Rice Intensification (SRI)’ introduced in Sri Lanka around the turn of the Century. It was some form of environment-friendly, water-saving organic farming project with labour-intensive field operations, especially the transplanting procedure aimed at the exploitation of potential plant growth and the tillering capacity in rice to maximise yield. After a few years’ lapse, no farmers involved in the project could be traced to review its progress. If a technology is appropriate, you may notice lateral spread of the technology from farmer to farmer without any extension effort.

Inorganic Nitrogen as plant nutrient

At the beginning of the 20th Century, the application of Nitrogen (N) to improve rice yields was attempted using the American experience of Sodium Nitrate (NaNO3) in upland crops (Soybean). Nagaoka (1905) and, Daikuhara and Imaseki (1907) reported the superiority of Ammonium Sulphate ((NH4)2SO4) to NaNO3 as the source of N for rice. Subsequently, the basic investigations on the application of N for rice were made in Japan, India and Hawaii, confirming the superiority of the Ammonium form of N (NH4+) in rice, the process of nitrification and ammonification under different soil moisture regimes and the Nitrite (NO2-) toxicity when the concentration exceeds five to six parts per million (5-6 ppm) upon submergence of aerobic or nitrate-rich soil. One should realise that N in submerged soil, irrespective of its source (organic or inorganic), exists in the form of Ammonium ion (NH4+), a fact established universally.

Joachim (1927) stressed the importance of liberal manuring to improve yields at the onset of genetic improvement of crops, particularly when the pure-line selection was initiated with traditional rice varieties. However, excessive manuring succumbs the rice crop to diseases (Blast and Brown spot); the crop tends to grow excessively vegetative and lodges prematurely affecting yield. Though some improvement of N response was developed by introducing disease tolerant ‘H’ varieties from the late 1950s, the basic defects of the traditional plant type, leafiness and lodging, prevailed. The introduction of new plant types (modern varieties) improved significantly the harvest index of the plant and the grain yield response to added N. A new source of N, Urea (46 percent N), was introduced in the early 1970s to contain soil acidity developed by the regular use of Ammonium Sulphate (21% N) and Urea was utilised extensively thereafter as the major source of N.

The 16 t/ha compost requirement (105 kg N) of the example discussed in the previous section can clearly be fulfilled with 230 kilograms of Urea. Furthermore, the crop requirement at different growth stages can be met by the split application of Urea, as the N content of Urea will be available to the plant shortly after its field application.

Urea, (CO(NH2)2), is an organic compound denied in organic farming with a molecular structure composed of Carbon, Oxygen and two Amine groups with no toxic elements. The amine groups are apparently converted to ammonium ion (NH4+) by soil microbes under anaerobic conditions and get adsorbed to the Cation Exchange Complex. Any source of N, whether organic or inorganic, undergoes the same process of ammonification in submerged soils to form ammonium ion. If the soil is rich in CEC, the ammonium ion is kept tightly bound to the Soil Cation Exchange Complex and leaching and contamination of groundwater will be contained or minimised. As it is, the most appropriate solution to the current crisis is the recommendation of an organic-inorganic combination of fertilisers as recommended by the Department of Agriculture. This will enhance the efficiency of both factors, organic and inorganic, synergistically and prolong the availability of N for crop growth without contamination of groundwater. Also, the quantity of N can be reduced substantially without affecting the performance of the crop as the N component is thereby efficiently utilised.

Also, some scientists are investigating atmospheric N fixing microbes, specifically in the root zone soil (rhizosphere) and within the plant (endophytic). If this is a realistic goal and if the naturally occurring microbes can fix N beyond their biological limits, we are fortunate as the atmosphere around us is full of Nitrogen (80 percent). To observe N fixing soil microbial activity, some rice plots were maintained for more than 30 years at the RRDI, Batalagoda, without added fertiliser. Intuitively, by judging from the rice yields, I infer that the microbes associated in the soil of these plots are not capable of fixing more than 40 kg N per hectare, probably the biological limit of microbes and that too will be diminished when the crop requirement is met with added Nitrogen. Similarly, the inoculated rice plants, with endophytic bacteria to fulfil the N requirement of rice, would be a long shot. There were other concepts considered, promising in atmospheric N fixation in rice, but were abandoned prematurely as the technologies were found to be inappropriate; for example, Azolla-Anabaena complex and root nodulation in Sesbania species.

Any waste should not be converted to compost or organic manure as some sources are contaminated with heavy metals and other toxic products. Animal waste may carry residues of antibiotics used as growth promoters. The danger of developing antibiotic tolerant or resistant human pathogenic bacteria by free exposure to antibiotic residues or by exchange of genetic material (conjugation) among bacterial mutants with human pathogens is not ruled out.

The current status of rice production in the country was achieved through the mutual development of related technologies for more than a century. It is not a matter to be ruled out by the so-called expert advisors with one stroke of a pen; as a result of the transition to nontoxic organic rice cultivation, the loss incurred in national rice production will be colossal. This is not the time to learn organic rice cultivation with the textbook experience of experts with no field experimental evidence. The incidence of COVID-19 and other natural calamities (floods, droughts) would adversely affect global rice production and surplus production in rice exporting countries cannot be predicted. In this scenario, national food security for Sri Lanka could be further threatened disastrously through this adventure in organic farming that has been launched almost overnight, without any foresight whatsoever.

In the past, we had an excellent Agricultural Extension and Education System composed of regular Technical Working Group Meetings, Research-Extension Dialogues, Inservice Training Programmes and Field Visits, and a well-qualified, dedicated set of extension staff promoted Good Agricultural Practices (GAP) in rice production. This system should be revitalised to sustain the food security of the country.

(The writer is a former Director, Rice Research and Development Institute)



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Features

‘Lord Edgware Dies’

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It has been some time since I read an Agatha Christie, the plot of which I cannot remember. So, I was delighted to find on the shelves of a friend Lord Edgware Dies, which I had a vague memory of, but no certainty about who had done it.

When I read it, I found that my memory of who was probably the killer was correct, but I could not be certain and the red herrings Christie threw in were so diverting that until almost the very end I wondered if I had been wrong.

The plot is very simple. Jane Wilkinson, who is married to Lord Edgware, tells him that she is desperate for a divorce since she is in love with a very proper Anglo-Catholic peer, Lord Melton, but Edgware refuses to divorce her. She asks Poirot to talk to him, which he does, and is surprised to find that Edgware has told Jane he is prepared to give her a divorce. This was, after he had categorically refused, through a letter, which Jane said she had not received.

That night Edgware is murdered, after Jane had been to see him, or so the butler said, and also Edgware’s secretary. But Jane had been that evening at a grand dinner many miles away, where a dozen fellow guests could swear to her presence.

There was a solution however to the mystery of two Jane Wilkinsons, namely a skilful impersonator called Carlotta Adams who, in the opening chapter had impersonated Jane Wilkinson, who had also been at the performance. But when Poirot goes to see her, he finds that she had been found dead on the morning after Edgware had been killed, of an overdose. And in her bag was a gold case, with a strange inscription, that contained the drug, along with a pair of pince-nez.

Her maid said she had written a letter to her sister in America and posted it the previous night. Poirot asks Inspector Japp to get the letter, and a transcript is received from America, and in it the name of Edgware’s nephew Ronald Marsh is mentioned; he had taken Carlotta to dinner after her performance, with which the book opens, and had then set her a challenge. Japp arrests Marsh, but Poirot is not happy and asks for the original of the letter, which the sister sends him. That shows that a page is missing, and the tear is obvious, though that raises the question as to why it had not simply been cut.

Matters are further complicated by the fact that Marsh had gone in a taxi to the Edgware house, along with Edgware’s daughter Geraldine, in the interval of an opera which had previously seemed to provide them with cast iron alibis. Geraldine had gone in to fetch her pearls so that Marsh could raise money he needed, and thus had an opportunity to kill Edgware, as did Marsh, for the driver said he had got out of the taxi while waiting and gone into the house.

Agatha Christie

Marsh explained why he had gone to the house on the night of the murder as having followed Bryan Martin, an American actor, who had been in love with Jane, whom he saw go into the house with a key. But there was no one visible when he entered, and Geraldine almost immediately came down and they left together. And Martin too has become an object of suspicion to Poirot, for he had been to see him before the murders were discovered with a story of being followed by a man with a gold tooth – a story Poirot immediately realized was false when he was asked how old the man was, and was told he was young, for young people did not have gold teeth.

A heap of French money Edgware had got for a trip to Paris was missing, but since Marsh had no need for it after his cousin’s offer of help, Poirot deduces that it must have been taken by the butler, who has disappeared. Christie has stressed that he is astonishingly handsome, unusual in a butler, and Poirot notes a resemblance to Martin, so he thinks the mysterious man going into the house must have been him.

Incidentally, later Poirot assumes that Edgware’s change of mind was because he was involved in some scandal, and I believe Christie intends us to see the cause of this in his handsome butler, though this is not specified.

Meanwhile, Poirot has asked Japp to find out the provenance of the case found in Carlotta’s handbag, and it turns out to have been made in Paris, specially commissioned, and collected by a woman with pince-nez.

But then another murder occurs—that of another guest at the grand dinner, which provided Jane with her alibi. The victim is an actor who had been bemused when Jane, at a lunch, thought the Judgment of Paris referred to the city. He told Hastings he wanted to see Poirot, but was killed before he could get to the appointment. Poirot had rushed there when told about his request, but it was too late.

Meanwhile, Poirot has tried out the pince-nez on Edgware’s secretary, but she could not see through these. It was only a chance remark heard outside the theatre that led him to try them out on Wilkinson’s maid Ellis, a spare pair that had been appropriated for the night of the murders.

Poirot then lays things out, having summoned Martin and told him that he probably suppressed Edgware’s letter, as he had been dropped by then and he did not want Jane to marry another. But after teasing Martin, Poirot says that Jane was in fact the murderer, and she got Carlotta to impersonate her at the dinner while she went to the house and killed her husband. After meeting Carlotta later and checking with her through a call that she had not been rumbled, Jane had gone ahead with the murder – she put veronal into her drink and the case with veronal into the handbag. She forgot to take out the pince-nez she had used earlier to imitate an American. Carlotta had registered as the American in a hotel and Jane had gone to see her, and there they exchanged identities. After seen the letter, she made use of it by tearing off the page that referred to her, and the S of She, so that the person who had challenged Carlotta to impersonate her seemed to be a man.

There is a coda in which Jane, condemned to death, writes to Hastings, still full of pride at her ingenuity hoping she will be remembered.

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Desilt reservoirs, learn from our ancient irrigation systems

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Polgolla

by Prof. O. A. Ileperuma

Silting of reservoirs is a major problem today affecting our hydropower production and irrigation systems. The main Mahaweli reservoirs are silted to a considerable extent reducing the water holding capacity of them. Due to poor soil management practices, floodwaters deposit large amounts of silt in these reservoirs. When the Polgolla reservoir was fully drained about two years back, one could see mountains of silt in the lower reaches of the reservoir. A rough estimate is that 50% of the total capacity of these reservoirs has been lost to siltation. This is a serious issue which affects not only power and agriculture but also flood control.

Our ancient irrigation systems ensured that desilting of reservoirs took place under royal decree where all users of the reservoirs were ordered to carry out desilting of reservoirs during the dry season. The clay thus collected was used in making bricks for the construction of great stupas which dot the landscape of our ancient kingdoms. This ensured that the reservoirs had their full capacity filled with water for the next cultivating season. Our ancient kings were clever enough not to construct reservoirs by blocking main rivers such as the Mahaweli. A classic example is the Minipe left canal where they tapped only the surface water of Mahaweli. Even the bigger tanks such as Nuwara Wewa and Parakrama Samudraya were fed with minor rivulets. There were also other ingenious features in the cascade irrigation systems built by the ancient kings, such as mud sluice canals and forest reservations between the reservoirs in the cascade system. These reservations helped trap silt and remove excess nutrients, which could otherwise contribute to increasing salinity as water flowed from one reservoir to another.

Victoria

Moragahakanda

A classic engineering marvel is the former Yoda Ela, which carries water from Kalawewa to Nuwara Wewa and Tissa Wewa. It is 87 km long although the straight distance between these points is only about 40 km. The gradient of this canal is about 10 cm per km or 6 inches per mile. Yodha Ela functions as a moving reservoir and feeds about 4,600 hectares of paddy lands. It is a winding canal with about 120 smaller reservoirs on its way. It was constructed during the reign of King Dhatusena around 459 AD and later expanded by King Parakramabahu by connecting more reservoirs to the network. Unfortunately, during the Mahaweli project our modern-day engineers constructed a concrete canal replacing the winding path of this Yoda Ela also called Jaya Ganga. This effectively removed the ability of the old Yoda Ela to remove silt and nutrients. The bank of this Ela has wet zone trees such as jak and areca nut growing well. They take up the nutrients from the flowing stream making the water suitable for irrigation later.

Ancient Mesopotamian civilisations depended on dams constructed along the two main rivers, Euphrates and Tigris. After continuous irrigation of their fields over several thousand years, salinity of the irrigated lands increased making them unsuitable for agriculture. People died due to famine and this clearly illustrates the danger of blocking main rivers for agriculture. There is scientific evidence that the salinity of paddy soils in the Mahaweli C area is increasing.

We saw the devastation caused by Cyclone Ditwah. The sluice gates of the Kotmale Reservoir were opened, and Kandy and Peradeniya were flooded. If the reservoir had had greater storage capacity, couldn’t the opening of the gates have been delayed? This may not be an argument that modern-day engineers would readily accept, and I am not an irrigation expert. These ideas may well be naïve. But most of us tend to think of reservoirs mainly in terms of hydropower generation and irrigation, while their role in flood control receives much less attention. The question therefore deserves serious consideration. Could restoring lost reservoir capacity through desilting help improve our ability to manage extreme rainfall and reduce flood risks?

Desilting our reservoirs should be considered a national priority.

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Losing out to Ethiopia

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From Trailblazer to Tailender

Export diversification – Missing the wood for the trees – Part III

by Gomi Senadhira

In Sri Lanka, the word “Ethiopia” is often used as disparaging slang to describe individuals or areas experiencing extreme poverty, starvation, or severe economic hardship. This linguistic habit originated in the 1980s with the Western media coverage of the devastating Ethiopian famine of 1983-85. That media coverage shocked the world but also left an outdated and offensive global stereotype that the country is permanently starving. Much has changed since then. By now, with an annual growth rate of around 9%, it is the fastest-growing economy in sub-Saharan Africa. Ethiopia has also emerged as a highly competitive exporter and is challenging not only its competitors in the region but also countries like Sri Lanka. This article is on how Sri Lanka has lost ground to Ethiopia (and a few other countries) in the GCC markets for agricultural and floricultural products.

Sri Lanka – A Pioneer in the Agriculture and Floricultural Market in the GCC

As discussed in Part II of this article, by the mid-1980s Sri Lanka had established a strong foothold in the GCC’s fruit, vegetable, and floricultural market. Geographical proximity and well-established shipping and air links gave Sri Lanka a strong comparative advantage over Southeast Asian and African nations. Thailand, Vietnam, and Kenya were not even in the market. At that time, Ethiopia was experiencing (as BBC news reports described) “a biblical famine”.

The market was not very large, but it was lucrative and growing. Trade Minister Lalith Athulathmudali as well as the Chairman of the Export Development Board, Victor Santiapillai, who visited Kuwait (and the GCC countries), recognised the market potential for these products and encouraged us to continue with our work. The minister was particularly keen to further develop links between the market for these products, exporters, and his Export Production Villages (EPVs). So, it was becoming a successful case not only for export diversification but also for transferring gains from exports directly to rural households.

From Trailblazer to Tailender

As a result, even by the beginning of this century Sri Lanka had a larger market share than most of its competitors from Asia or Africa. But since then, our competitiveness has weakened significantly. The tables below provide a comparative snapshot of Sri Lanka’s performance vis-à-vis Thailand, Vietnam, Kenya and Ethiopia in the GCC market for vegetables, fruits and floricultural products. As illustrated therein, in 2001 Sri Lanka was ahead of Thailand, Kenya and Ethiopia in this small but rapidly growing market. Since then, we have fallen behind Thailand, Kenya and many other countries in that lucrative market. If this trend continues, Sri Lanka will fall behind Ethiopia within the next few years. (See Table 1)

In the GCC market for vegetables (covered in HS chapter 07), Sri Lanka was ahead of most other competitors in 2001. As illustrated in Table 1 , Sri Lanka had failed to develop this market, while Thailand, Kenya, and even Ethiopia had very efficiently increased their market shares. The GCC is a market to which Sri Lanka can supply some vegetables, like cabbages, by sea. It appears Sri Lanka had also failed to exploit this mode of supply.

We can see a similar trend in the market for fruits. Vietnam, Kenya, and Thailand have emerged as major players, while exports from Sri Lanka have staggered on slowly. In this segment, Vietnam has emerged as a leading player during the last twenty years and the GCC imports from Viet Nam have shot up from US$44 thousand in 2001 to US$346 million by 2024. In part one of these articles, I discussed the remarkable increase of jackfruit exports from Vietnam “…just $3 million in 2015 to an impressive $236.8 million in 2023” while most of our jackfruit production rots under the trees. This explains how countries develop their markets, geographically and product-wise. (See Table 2)

Sri Lanka’s performance has been weakest in the market for floricultural products (HS Chapter 06), which groups live trees, cut flowers, and ornamental foliage. When we first entered the market in the 1980s, the market was dominated by the Netherlands, and Kenya and Ethiopia were not even in the market. At that time, we identified the Gulf states as a market where Sri Lanka could have a dominant presence due to geographical proximity. Even in 2001, Sri Lanka was ahead of Kenya, Ethiopia, and Thailand. But by now, Kenya has emerged as the dominant supplier. Ethiopia is also expanding its market share and is the third-largest exporter. (See Table 3)

Missing the Wood for the Trees

In the mid-1980s, Sri Lanka first established its foothold in the GCC market. Since then, Thailand, Vietnam, Kenya, and even Ethiopia have moved well ahead of us and have become leading players. Why did we lag behind in our export diversification efforts in general and, more particularly, in the GCC market?

The reasons are very clear. After the initial attempts in the 1980s and early 1990s, Sri Lanka has not been proactively involved in identifying, developing, and promoting new products and markets, or protecting and further developing new markets already established. The focus has simply been on traditional exports: tea, coconut, cinnamon, and garments, while other products were almost ignored. In essence, we have been and continue to focus intensely on a narrow group of products and markets, and we have lost sight of the bigger picture.

(The writer can be reached at senadhiragomi@gmail.com)

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