Pub Date : 2021-08-19DOI: 10.3997/2214-4609.202182040
R. Rodríguez, O. Orešković
Summary Condition based maintenance is a strategy that can extend the operational life of rotating machines. The philosophy originates from more traditional, time-based maintenance strategies where activities are scheduled based on the running hours of a machine. Instead the condition-based maintenance is optimized in such a way that these activities are only carried out when the condition of the machine indicates the repair or maintenance. The condition can be determined with a variety of monitoring technologies including those where the data is recorded periodically, or continuous, when the machine is in operation. Machine Condition Monitoring systems ensure the longevity and reliability of machines and are commonly used in practice on many different types of assets, including rotating machines. For on-line continuous monitoring multiple technologies are incorporated into a common software platform for easier analysis and data correlation. This paper focus on on-line monitoring and analysis SW toolkit with an example of its usage on large rotating machines (hydro generators and high voltage motors).
{"title":"Asset Analytics Toolkit and Monitoring Service for Rotating Machines","authors":"R. Rodríguez, O. Orešković","doi":"10.3997/2214-4609.202182040","DOIUrl":"https://doi.org/10.3997/2214-4609.202182040","url":null,"abstract":"Summary Condition based maintenance is a strategy that can extend the operational life of rotating machines. The philosophy originates from more traditional, time-based maintenance strategies where activities are scheduled based on the running hours of a machine. Instead the condition-based maintenance is optimized in such a way that these activities are only carried out when the condition of the machine indicates the repair or maintenance. The condition can be determined with a variety of monitoring technologies including those where the data is recorded periodically, or continuous, when the machine is in operation. Machine Condition Monitoring systems ensure the longevity and reliability of machines and are commonly used in practice on many different types of assets, including rotating machines. For on-line continuous monitoring multiple technologies are incorporated into a common software platform for easier analysis and data correlation. This paper focus on on-line monitoring and analysis SW toolkit with an example of its usage on large rotating machines (hydro generators and high voltage motors).","PeriodicalId":147283,"journal":{"name":"First EAGE Workshop on Geothermal Energy in Latin America","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115808713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-19DOI: 10.3997/2214-4609.202182003
D. Pinti, A. López-Hernández, M. Castro, C. Hall, O. Shouakar‐Stash, M. Ramírez-Montes
Summary Helium as a noble gases can be successfully used as tracers of the different fluid components which make a geothermal water, namely magmatic, meteoric and fossil groundwater. Here, case histories from geothermal fields of Mexico are reported.
{"title":"Helium isotopes as a tool for deciphering fluid evolution in geothermal reservoirs","authors":"D. Pinti, A. López-Hernández, M. Castro, C. Hall, O. Shouakar‐Stash, M. Ramírez-Montes","doi":"10.3997/2214-4609.202182003","DOIUrl":"https://doi.org/10.3997/2214-4609.202182003","url":null,"abstract":"Summary Helium as a noble gases can be successfully used as tracers of the different fluid components which make a geothermal water, namely magmatic, meteoric and fossil groundwater. Here, case histories from geothermal fields of Mexico are reported.","PeriodicalId":147283,"journal":{"name":"First EAGE Workshop on Geothermal Energy in Latin America","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122334688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-19DOI: 10.3997/2214-4609.202182022
P. Santos, J. Rivas
Summary The purpose of this report is to present the geophysical characterization of the Berlin geothermal field reservoir, based on results of different methodologies carried out in different moment, such us: MT, passive seismic and gravity. From MT results, the reservoir corresponds to a resistivity range of 50–90 Ohm- m inside the resistive dome. Its estimated thickness varies from 600 to 800 m. From the 9 years seismic data collected, a seismic tomography modelling was built, this model shows that production zone has good correlation to a seismic waves speed ratio (Vp/Vs) lower than 1.7. The area of this anomaly correlates very well with that suggested by the MT method. Finally the gravity survey result suggests that the Berlin producer reservoir is associated to a high positive gravimetric anomaly which it extends toward the south and southwest of the actual production zone, beyond to the Berlin town.
{"title":"Geophysical Reservoir Characterization of Berlin Geothermal Field, El Salvador","authors":"P. Santos, J. Rivas","doi":"10.3997/2214-4609.202182022","DOIUrl":"https://doi.org/10.3997/2214-4609.202182022","url":null,"abstract":"Summary The purpose of this report is to present the geophysical characterization of the Berlin geothermal field reservoir, based on results of different methodologies carried out in different moment, such us: MT, passive seismic and gravity. From MT results, the reservoir corresponds to a resistivity range of 50–90 Ohm- m inside the resistive dome. Its estimated thickness varies from 600 to 800 m. From the 9 years seismic data collected, a seismic tomography modelling was built, this model shows that production zone has good correlation to a seismic waves speed ratio (Vp/Vs) lower than 1.7. The area of this anomaly correlates very well with that suggested by the MT method. Finally the gravity survey result suggests that the Berlin producer reservoir is associated to a high positive gravimetric anomaly which it extends toward the south and southwest of the actual production zone, beyond to the Berlin town.","PeriodicalId":147283,"journal":{"name":"First EAGE Workshop on Geothermal Energy in Latin America","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129740431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-19DOI: 10.3997/2214-4609.202182035
A. Jentsch, E. Jolie
Summary The spatial variability of gas emissions at Earth’s surface is a proxy for structural discontinuities in the subsurface of geothermal systems. Thus, they provide reliable information on reservoir-scale to reduce the high exploration risk in geothermal projects and contribute to the site selection of costly production wells. In addition, permanent monitoring of geothermal gases at the surface allows to investigate temporal changes related to changing reservoir conditions. This represents an additional application of soil gas studies for a successful reservoir management. Here, we show a summary of selected case studies in geothermal systems worldwide highlighting the successful performance of comprehensive and systematic soil gas studies as a reliable geothermal exploration tool. In our studies we use integrated approaches by analyzing emission rates, concentration, and isotopes of the different volcanic gases and linking them to the deep reservoir. We consider soil gas studies as a complementary technique to well-established geophysical or geochemical exploration methods, which will help to improve conceptual models of geothermal systems. For this purpose, we have developed a mobile soil gas lab for flexible in-situ applications. Fluxtec focuses on the optimization and promotion of this type of survey, which is not yet commonly used in geothermal exploration.
{"title":"Fluxtec - Surveying Natural Gas Emissions in Geothermal Exploration","authors":"A. Jentsch, E. Jolie","doi":"10.3997/2214-4609.202182035","DOIUrl":"https://doi.org/10.3997/2214-4609.202182035","url":null,"abstract":"Summary The spatial variability of gas emissions at Earth’s surface is a proxy for structural discontinuities in the subsurface of geothermal systems. Thus, they provide reliable information on reservoir-scale to reduce the high exploration risk in geothermal projects and contribute to the site selection of costly production wells. In addition, permanent monitoring of geothermal gases at the surface allows to investigate temporal changes related to changing reservoir conditions. This represents an additional application of soil gas studies for a successful reservoir management. Here, we show a summary of selected case studies in geothermal systems worldwide highlighting the successful performance of comprehensive and systematic soil gas studies as a reliable geothermal exploration tool. In our studies we use integrated approaches by analyzing emission rates, concentration, and isotopes of the different volcanic gases and linking them to the deep reservoir. We consider soil gas studies as a complementary technique to well-established geophysical or geochemical exploration methods, which will help to improve conceptual models of geothermal systems. For this purpose, we have developed a mobile soil gas lab for flexible in-situ applications. Fluxtec focuses on the optimization and promotion of this type of survey, which is not yet commonly used in geothermal exploration.","PeriodicalId":147283,"journal":{"name":"First EAGE Workshop on Geothermal Energy in Latin America","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122539976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-19DOI: 10.3997/2214-4609.202182004
W. Segura
{"title":"Use of Graphs for the Analysis of Ecological Connectivity. Borinquen Geothermal Project","authors":"W. Segura","doi":"10.3997/2214-4609.202182004","DOIUrl":"https://doi.org/10.3997/2214-4609.202182004","url":null,"abstract":"","PeriodicalId":147283,"journal":{"name":"First EAGE Workshop on Geothermal Energy in Latin America","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126419627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-19DOI: 10.3997/2214-4609.202182019
A. Murillo, M. García, S. Kastl, A. Ermertz
Summary Drone technology for the exploration of geothermal resources is not yet common in Central America although the potential of including drone surveys in early exploration phases is high due to a fast and cost-effective application. The German Technical Cooperation Project Yacimientos II, implemented by the Federal Institute for Geosciences and Natural Resources (BGR) supports the institutions Instituto Costarricense de Electricidad (ICE) in Costa Rica and Empresa Nacional de Energia Electrica (ENEE) of Honduras to conduct pilot studies considering the implementation of thermal drone surveys in two study areas in Costa Rica and Honduras. Aim of this study is to successfully include this new approach in exploration studies in the SICA region, overcoming the challenges that arise during the different steps from flight planning, flight execution, the post-flight data processing, and finally the integration of the data into a GIS. The individual steps as well as the challenges that arose and possible solutions are described in this study.
{"title":"Remote Sensing and UAV Based Reconnaissance for the Identification and Characterization of Geothermal Surface Manifestations in Honduras and Costa Rica","authors":"A. Murillo, M. García, S. Kastl, A. Ermertz","doi":"10.3997/2214-4609.202182019","DOIUrl":"https://doi.org/10.3997/2214-4609.202182019","url":null,"abstract":"Summary Drone technology for the exploration of geothermal resources is not yet common in Central America although the potential of including drone surveys in early exploration phases is high due to a fast and cost-effective application. The German Technical Cooperation Project Yacimientos II, implemented by the Federal Institute for Geosciences and Natural Resources (BGR) supports the institutions Instituto Costarricense de Electricidad (ICE) in Costa Rica and Empresa Nacional de Energia Electrica (ENEE) of Honduras to conduct pilot studies considering the implementation of thermal drone surveys in two study areas in Costa Rica and Honduras. Aim of this study is to successfully include this new approach in exploration studies in the SICA region, overcoming the challenges that arise during the different steps from flight planning, flight execution, the post-flight data processing, and finally the integration of the data into a GIS. The individual steps as well as the challenges that arose and possible solutions are described in this study.","PeriodicalId":147283,"journal":{"name":"First EAGE Workshop on Geothermal Energy in Latin America","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133936535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-19DOI: 10.3997/2214-4609.202182024
J. Hernandez
Summary Show a comparison of the relevant geochemical and thermohydraulic characteristics of the fluids of the geothermal fields in production Alfredo Mainieri Protti, Las Pailas I & II and the field in development Borinquen that have allowed their current productive development. Although geographically both volcanoes are very close, the volcanic activities resulting from their origin are different and affect the formation of geothermal reservoirs associated with the Miravalles and Rincon de la Vieja Volcanoes relative to each of the fields.
{"title":"Geochemical and Thermohydraulic comparison between different geothermal fields Miravalles, Pailas I & II and Borinquen in the volcanic range of Guanacaste, Costa Rica","authors":"J. Hernandez","doi":"10.3997/2214-4609.202182024","DOIUrl":"https://doi.org/10.3997/2214-4609.202182024","url":null,"abstract":"Summary Show a comparison of the relevant geochemical and thermohydraulic characteristics of the fluids of the geothermal fields in production Alfredo Mainieri Protti, Las Pailas I & II and the field in development Borinquen that have allowed their current productive development. Although geographically both volcanoes are very close, the volcanic activities resulting from their origin are different and affect the formation of geothermal reservoirs associated with the Miravalles and Rincon de la Vieja Volcanoes relative to each of the fields.","PeriodicalId":147283,"journal":{"name":"First EAGE Workshop on Geothermal Energy in Latin America","volume":"64 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126970870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-19DOI: 10.3997/2214-4609.202182013
C. Franco, D. Martinez, M. Gutiérrez, J. Pataquiva, J. Rojas, D. Jaramillo, G. Foo, S. Cespedes, F. Cortés
Summary A pilot of co-produced fluid geothermal power generation has been implemented by Parex Resources in the Llanos Orientales sedimentary basin, Colombia’s largest oil producing region. This project represents the first generation of geothermal power in Colombia and demonstrates the viability of geothermal power production alongside oil and gas production in this setting. The pilot makes use of modular Organic Rankine Cycle (ORC) technology to convert the thermal energy from produced oilfield water to electrical power at temperatures below 100°C. Currently, the pilot generates 70kWe net of baseload, emissions-free power. Approximately 550 tonnes of carbon dioxide emissions per year will be eliminated through the operation of this pilot. This work highlights the importance of geothermal power as an energy efficiency measure in actively producing oilfields. Several technical and economic advantages of co-produced fluid oilfield geothermal in active oilfields are discussed, in comparison to the conversion of abandoned oilfield assets for geothermal power production.
{"title":"Oilfield Application of Co-produced Fluid Geothermal Power in Colombia’s Llanos Orientales Basin","authors":"C. Franco, D. Martinez, M. Gutiérrez, J. Pataquiva, J. Rojas, D. Jaramillo, G. Foo, S. Cespedes, F. Cortés","doi":"10.3997/2214-4609.202182013","DOIUrl":"https://doi.org/10.3997/2214-4609.202182013","url":null,"abstract":"Summary A pilot of co-produced fluid geothermal power generation has been implemented by Parex Resources in the Llanos Orientales sedimentary basin, Colombia’s largest oil producing region. This project represents the first generation of geothermal power in Colombia and demonstrates the viability of geothermal power production alongside oil and gas production in this setting. The pilot makes use of modular Organic Rankine Cycle (ORC) technology to convert the thermal energy from produced oilfield water to electrical power at temperatures below 100°C. Currently, the pilot generates 70kWe net of baseload, emissions-free power. Approximately 550 tonnes of carbon dioxide emissions per year will be eliminated through the operation of this pilot. This work highlights the importance of geothermal power as an energy efficiency measure in actively producing oilfields. Several technical and economic advantages of co-produced fluid oilfield geothermal in active oilfields are discussed, in comparison to the conversion of abandoned oilfield assets for geothermal power production.","PeriodicalId":147283,"journal":{"name":"First EAGE Workshop on Geothermal Energy in Latin America","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122605157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-19DOI: 10.3997/2214-4609.202182027
Z. González-Acevedo, M. A. Zárate, M. Vázquez
Summary Good practices of geothermal exploration establish that environmental and social factors should be included in the early stages. This work presents the socio-environmental situation of three geothermal exploration zones in Mexico. In them, the geothermal resource and the social aspects are different, issuing recommendations to promote the development of geothermal projects at each site. The environmental and social conditions were evaluated through fieldwork and interviews. Acoculco, Puebla is a low permeability geothermal reservoir, with acidic fluids and a caldera heat source, the social characteristics are rural with lack of basic services and forest-oriented activities. El Chichonal, Chiapas is a volcano-related geothermal resource; in a small rural indigenous community, their main activities are livestock and the use of natural resources. In Los Negritos, Michoacan the geothermal resource is related to local tectonic faults. The social characteristic is complex in a semi-urban region with criminal activity. In spite of the differences, all sites agree with the development of informed communication of the benefits and possible damages that the geothermal project may cause; they express the need for employment, the interest to have education that will open the opportunity to be employed in the company and develop businesses related to the geothermal resources.
{"title":"SOCIO ENVIRONMENTAL SITUATION OF THREE GEOTHERMAL EXPLORATION SITES IN MEXICO","authors":"Z. González-Acevedo, M. A. Zárate, M. Vázquez","doi":"10.3997/2214-4609.202182027","DOIUrl":"https://doi.org/10.3997/2214-4609.202182027","url":null,"abstract":"Summary Good practices of geothermal exploration establish that environmental and social factors should be included in the early stages. This work presents the socio-environmental situation of three geothermal exploration zones in Mexico. In them, the geothermal resource and the social aspects are different, issuing recommendations to promote the development of geothermal projects at each site. The environmental and social conditions were evaluated through fieldwork and interviews. Acoculco, Puebla is a low permeability geothermal reservoir, with acidic fluids and a caldera heat source, the social characteristics are rural with lack of basic services and forest-oriented activities. El Chichonal, Chiapas is a volcano-related geothermal resource; in a small rural indigenous community, their main activities are livestock and the use of natural resources. In Los Negritos, Michoacan the geothermal resource is related to local tectonic faults. The social characteristic is complex in a semi-urban region with criminal activity. In spite of the differences, all sites agree with the development of informed communication of the benefits and possible damages that the geothermal project may cause; they express the need for employment, the interest to have education that will open the opportunity to be employed in the company and develop businesses related to the geothermal resources.","PeriodicalId":147283,"journal":{"name":"First EAGE Workshop on Geothermal Energy in Latin America","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131088570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-19DOI: 10.3997/2214-4609.202182026
A. Chacon, K. C. Cambronero
Summary Metrological management represents a critical variable in the production of a geothermal field, to achieve compliance an effective measurement management system is implemented that ensures that the measurement equipment and processes are adequate for their intended use, in order to achieve the product quality objectives and manage risk. of incorrect measurement results. Under this concept, the Geothermal Resources production process has implemented its internal verifications, based on methodologies validated through technical experience and knowledge of measurements and variables associated with quality, which are a fundamental basis for improving competitiveness. The article aims to show the evolution and impact of the metrology implemented in Geothermal Resources, in the variables of temperature and pressure measurement in the geothermal field operation processes. For the analysis, the behavior of two equipment used in the separation stations of a geothermal field is shown.
{"title":"Metrological Control of Temperature and Pressure Variables in the Geothermal Field Alfredo Mainieri Protti.","authors":"A. Chacon, K. C. Cambronero","doi":"10.3997/2214-4609.202182026","DOIUrl":"https://doi.org/10.3997/2214-4609.202182026","url":null,"abstract":"Summary Metrological management represents a critical variable in the production of a geothermal field, to achieve compliance an effective measurement management system is implemented that ensures that the measurement equipment and processes are adequate for their intended use, in order to achieve the product quality objectives and manage risk. of incorrect measurement results. Under this concept, the Geothermal Resources production process has implemented its internal verifications, based on methodologies validated through technical experience and knowledge of measurements and variables associated with quality, which are a fundamental basis for improving competitiveness. The article aims to show the evolution and impact of the metrology implemented in Geothermal Resources, in the variables of temperature and pressure measurement in the geothermal field operation processes. For the analysis, the behavior of two equipment used in the separation stations of a geothermal field is shown.","PeriodicalId":147283,"journal":{"name":"First EAGE Workshop on Geothermal Energy in Latin America","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123496366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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