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See detailClustering-based Adaptive Beam Footprint Design for 5G Urban Macro-Cell
Jubba Honnaiah, Puneeth UL; Lagunas, Eva UL; Maturo, Nicola et al

in 2021 IEEE 4th 5G World Forum (5GWF) - Track 1: 5G Technologies (2021)

In a dense 5G urban-eMBB environment, the user density and traffic loads follow a spatiotemporal variability. To meet high traffic demands, the 5G base stations exploit spatial multiplexing by means of ... [more ▼]

In a dense 5G urban-eMBB environment, the user density and traffic loads follow a spatiotemporal variability. To meet high traffic demands, the 5G base stations exploit spatial multiplexing by means of Active Antenna Systems (AAS) and beamforming. However, pedestrian and vehicular users are highly mobile, rendering non-dynamic beamforming designs totally inefficient in terms of meeting the users’ demand requests. In particular, the latter results in either overload or underutilized beams in a cell. Hence, a practical approach to meet such spatio-temporal heterogeneous demand is to consider dynamic and adaptive beam footprint design that takes into account both the actual users’ position as well as the traffic loads. In this paper, we first study and evaluate the state-of-the-art fixed cell beamforming (based on ITU-R M.2412-0) in a test environment and highlight its drawbacks. Next, we propose a adaptive macro-cell beam footprint design where the beams are dynamically shaped based on the spatial users distribution and their demand requests. Numerical simulations demonstrate the high system performance achieved by the proposed methodology. [less ▲]

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See detailIs There More Than the Answer to the Question? Device Use and Completion Time as Indicators for Selectivity Bias and Response Convenience in Online Surveys
Decieux, Jean Philippe Pierre UL

in Erlinghagen, Marcel; Ette, Andreas; Schneider, Norbert (Eds.) et al The Global Lives of German Migrants (2021)

The main objective of the German Emigration and Remigration Panel Study (GERPS) is to establish a longitudinal data set that provides information on life trajectories of international migrants. However, a ... [more ▼]

The main objective of the German Emigration and Remigration Panel Study (GERPS) is to establish a longitudinal data set that provides information on life trajectories of international migrants. However, a large amount of paradata were also collected in order to obtain meta-information on respondents’ survey participation. This auxiliary information can help to optimize data quality at all stages of the survey process. By continuing the existing discussion in the field of online surveys, this chapter pursues a twofold objective: it reflects device usage (mobile vs. computer) and elucidates determinants of device choice. In particular, it analyses whether selectivity effects due to respondent’s device choices bias the sample. Moreover, this chapter investigates differences in response time between devices to detect differences in response burden. The analysis of response burden differences by device is an important issue, since an increased device-specific response burden can be a predictor of actual and further panel dropouts. In both device-specific selectivity and survey burden, only slight differences were found between mobile and desktop devices. Using these data, the following paper addresses the need to analyse potential sources of survey error and provides evidence that GERPS data do not appear to contain noteworthy bias attributed to device usage. [less ▲]

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See detailFrench version of the General Self-Efficacy Short Scale (FASKU)
Decieux, Jean Philippe Pierre UL; Sischka, Philipp UL; Schumacher, Anette UL et al

Report (2021)

The ASKU is an economic instrument for recording individual competence expectations to be able to deal with difficulties and obstacles in daily life. It was originally developed and validated in German by ... [more ▼]

The ASKU is an economic instrument for recording individual competence expectations to be able to deal with difficulties and obstacles in daily life. It was originally developed and validated in German by Beierlein, Kemper, Kovaleva, & Rammstedt (2013). In 2019 we developed and tested a French Version of this scale and tested it for reliability (internal consistency), validity and measurement equivalence towards the original German Version (see Décieux et al., 2020). The provided evidence on the quality of the German and the French Version of ASKU (FASKU) indicates that the scales allow a reliable, valid and economic assessment of subjective competence expectations and that the two language versions can be used to a [less ▲]

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See detailGerman Labor Emigration in Times of Technological Change: Occupational Characteristics and Geographical Patterns
Decieux, Jean Philippe Pierre UL; Mergener, Alexandra

in Sustainability (2021), 13(3),

Technological change has altered labor market demands within well-developed societies implying global competition for skilled labor and, as a consequence, new forms of labor migration. So far, patterns of ... [more ▼]

Technological change has altered labor market demands within well-developed societies implying global competition for skilled labor and, as a consequence, new forms of labor migration. So far, patterns of this labor migration have been underexplored. Thus, the article analyzes characteristics, geographies and possible underlying drivers of workers migrating from Germany as an exemplary case for a well-developed country. Relying on probability-based and unique data, our findings reveal that, besides demand for people with higher levels of education, performing specific occupational tasks is also in demand in the global competition for talent. Hence, Germans in jobs with a high proportion of analytical non-routine tasks are more likely to emigrate than those with predominantly manual routine tasks. Moreover, the results show that global discrepancies concerning the technological development between the country of origin and the country to which they emigrate are a crucial contextual driver attracting this specifically demanded work force. Workers mainly performing analytical non-routine tasks within their job tend to move to countries which are technologically more developed than Germany while individuals performing jobs with a high share of non-routine manual or interactive tasks tend to emigrate to countries that are less technologically developed than Germany. [less ▲]

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See detailEnhancing Participation in Probability-Based Online Panels: Two Incentive Experiments and their Effects on Response and Panel Recruitment
Witte, Nils; Schröder, Jette; Schauer, Ines et al

Report (2021)

This article investigates how mail based online panel recruitment can be facilitated through incentives. The analysis relies on two incentive experiments and their effects on panel recruitment and the ... [more ▼]

This article investigates how mail based online panel recruitment can be facilitated through incentives. The analysis relies on two incentive experiments and their effects on panel recruitment and the intermediate participation in the recruitment survey. The experiments were implemented in the context of the German Emigration and Remigration Panel Study and encompass two samples of randomly sampled persons. Tested incentives include a conditional lottery, conditional monetary incentives, and the combination of unconditional money-in-hand with conditional monetary incentives. For an encompassing evaluation of the link between incentives and panel recruitment, the article further assesses the incentives’ implications for demographic composition and panel recruitment unit costs. Multivariate analysis indicates that low combined incentives (€5/€5) or, where unconditional disbursement is unfeasible, high conditional incentives (€20) are most effective in enhancing panel participation. In terms of demographic bias, low combined incentives (€5/€5) and €10 conditional incentives are the favored options. The budget options from the perspective of panel recruitment include the lottery and the €10 conditional incentive which break even at net sample sizes of 1,000. [less ▲]

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See detailSurveying Across Borders: The Experiences of the German Emigration and Remigration Panel Study
Ette, Andreas; Decieux, Jean Philippe Pierre UL; Erlinghagen, Marcel et al

in Erlinghagen, Marcel; Ette, Andreas; Schneider, Norbert (Eds.) et al The Global Lives of German Migrants (2021)

International migration is often characterised as a process of immigration from economically less developed to highly developed countries. Whereas the factors driving those flows and the integration of ... [more ▼]

International migration is often characterised as a process of immigration from economically less developed to highly developed countries. Whereas the factors driving those flows and the integration of the respective ethnic groups are widely analysed, the international mobility of the populations of precisely those affluent societies is regularly missed and less-frequently studied. The chapter describes the research design of the German Emigration and Remigration Panel Study as one of the first endeavours to study the internationally mobile populations from prosperous welfare states. Following an origin-based probability sampling of internationally migrating German citizens, it offers survey data to study the consequences of emigration and remigration along the life course. The chapter discusses the quality of this new data infrastructure along the survey lifecycle and compares the distribution of central demographic characteristics in the survey with official reference statistics. The aim is to establish this approach as a new avenue for studying the global lives of internationally mobile populations. [less ▲]

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See detailA gravity analysis of refugee mobility using mobile phone data
Beine, Michel UL; Bertinelli, Luisito UL; Cömertpay, Rana UL et al

in Journal of Development Economics (2021)

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See detailDemand-Aware Beam Design and User Scheduling for Precoded Multibeam GEO Satellite Systems
Jubba Honnaiah, Puneeth UL; Lagunas, Eva UL; Maturo, Nicola et al

in 25th International ITG Workshop on Smart Antennas (WSA 2021) (2021)

For many years, satellite footprints have been fixed from the design phase until the last day of the satellite operational life. Flexibility in coverage by means of reconfigurable beams is becoming ... [more ▼]

For many years, satellite footprints have been fixed from the design phase until the last day of the satellite operational life. Flexibility in coverage by means of reconfigurable beams is becoming increasingly popular thanks to the recent developments in active antenna systems. On the other hand, spatial frequency reuse combined with precoding has been shown to boost the spectral efficiency while lowering the cost per bit. In this context, and motivated by the unbalanced demand requests of the satellite users, we propose a shift from the traditional system-throughput maximization design towards a demand-Aware design, where a new beam shaping technique and user scheduling are combined to satisfy the users’ demands. Supporting numerical results are provided that validate the effectiveness of the proposed beam planning and scheduling and quantify the benefits over conventional rigid techniques. [less ▲]

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See detailPower and Bandwidth Minimization for Demand-Aware GEO Satellite Systems
Abdu, Tedros Salih UL; Kisseleff, Steven UL; Lagunas, Eva UL et al

Scientific Conference (2021)

Smart radio resource allocation combined with the recent advances of digital payloads will allow to control the transmit power and bandwidth of the satellites depending on the demand and the channel ... [more ▼]

Smart radio resource allocation combined with the recent advances of digital payloads will allow to control the transmit power and bandwidth of the satellites depending on the demand and the channel conditions of users. The system flexibility is important not only to handle divergent demand requirements but also to efficiently utilize the limited and expensive satellite resources. In this paper, we propose a demand-aware smart radio resource allocation technique, where the transmit power and the bandwidth of the GEO satellite are minimized while satisfying the user demand. The formulated optimization problem is non-convex mixed-integer nonlinear program which is difficult to solve. Hence, we apply a quadratic transform to solve the problem iteratively. The numerical results showed that the proposed scheme outperforms the benchmark schemes in terms of bandwidth utilization while accurately providing capacity-ondemand. [less ▲]

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See detailComparing the Risk Attitudes of Internationally Mobile and Non-Mobile Germans
Lübke, Christiane; Decieux, Jean Philippe Pierre UL; Erlinghagen, Marcel et al

in Erlinhagen, Marcel; Ette, Andreas; Schneider, Norbert (Eds.) et al The Global Lives of German Migrants (2021)

Moving–particularly to a new country–is fraught with risks as migrants leave familiar legal frameworks and cultural institutions behind them. To date, little is known about the psychological determinants ... [more ▼]

Moving–particularly to a new country–is fraught with risks as migrants leave familiar legal frameworks and cultural institutions behind them. To date, little is known about the psychological determinants of international migration. This chapter helps to fill this gap by analysing data from the first wave of the German Emigration and Remigration Panel Study (GERPS) in combination with data on non-mobile individuals from the German Socio-Economic Panel Study (SOEP). The analyses presented examine whether the risk attitudes of internationally mobile Germans (‘movers’) differ from those of their non-mobile counterparts (‘stayers’). The results show that–with control for key socio-demographic and socio-economic determinants of risk affinity–both emigrants and remigrants report a significantly higher willingness to take risks than stayers. Risk affinity differs within the group of internationally mobile individuals: Emigrants moving to geographically and culturally distant non-European countries report higher risk affinity than those moving to Germany’s neighbouring countries. Emigrants with multiple previous emigration periods are also more willing to take risks. These findings suggest that voluntary emigration from wealthy countries like Germany is only partly a matter of living conditions. Rather, (repeated) emigration seems to be a matter of personality and an expression of a more adventurous lifestyle. [less ▲]

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See detailEmigration, Friends, and Social Integration: The Determinants and Development of Friendship Network Size After Arrival
Decieux, Jean Philippe Pierre UL; Mörchen, Luisa

in Erlinghagen, Marcel; Ette, Andreas; Schneider, Norbert (Eds.) et al The Global Lives of German Migrants (2021)

Friendships can be interpreted as voluntary relationships between individuals and characterised as relatively amorphous bond. Since migration usually diversifies people’s social bonds, it can be suggested ... [more ▼]

Friendships can be interpreted as voluntary relationships between individuals and characterised as relatively amorphous bond. Since migration usually diversifies people’s social bonds, it can be suggested that in this context friendships have to be reconfigured. Even though friendships are important for societal integration and related to individual well-being, migration research has treated friendships as a side issue. This chapter aims to narrow this gap by answering three questions: Are there significant differences between emigrants and non-mobiles in their number of close friends? What are important factors influencing emigrants’ number of close friends abroad? How does this number develop during the first years after emigration? Based on data from the German Emigration and Remigration Panel Study and the German Socio-Economic Panel, the results show that emigrants have more friends than non-mobiles. Additionally, we find that individual characteristics and cultural distance between emigrant and host society or the intension to stay in the emigration country are significantly related to emigrants’ friendship network size. Furthermore, we find that identification with the emigration country is the most influential factor on the size of the friendship networks during the first 2 years after arrival. Our results also provide some evidence that there is an optimal size of the close-friendship-network. [less ▲]

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See detailFASKU. French version of the General Self-Efficacy Short Scale [Test description and questionnaire]
Decieux, Jean Philippe Pierre UL; Sischka, Philipp UL; Schumacher, Anette UL et al

Report (2021)

The FASKU is an economical instrument for recording individual competence expectations of dealing with difficulties and obstacles in daily life. It was originally developed and validated in German by ... [more ▼]

The FASKU is an economical instrument for recording individual competence expectations of dealing with difficulties and obstacles in daily life. It was originally developed and validated in German by Beierlein, Kemper, Kovaleva, and Rammstedt (2013). In 2019, the authors developed and tested a French version of this scale (FASKU) and tested it for reliability (internal consistency), validity, and measurement equivalence towards the original German Version (see Décieux et al., 2020a). The provided evidence on the quality of the German and the French Version of ASKU (FASKU) indicates that the scales allow a reliable, valid, and economical assessment of subjective competence expectations and that the two language versions can be used to assess and compare self-efficacy in German- and French-speaking populations. [less ▲]

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See detailRoboMAX: Robotic Mission Adaptation eXemplars
Askarpour, Mehrnoosh; Tsigkanos, Christos; Menghi, Claudio UL et al

in Symposium on Software Engineering for Adaptive and Self-Managing Systems (SEAMS) - Artifact Track (2021)

Emerging and future applications of robotic systems pose unique self-adaptation challenges. To support the research needed to address these challenges, we provide an extensible repository of robotic ... [more ▼]

Emerging and future applications of robotic systems pose unique self-adaptation challenges. To support the research needed to address these challenges, we provide an extensible repository of robotic mission adaptation exemplars. Co-designed with robotic application stakeholders including researchers, developers, operators, and end-users, our repository captures key sources of uncertainty, adaptation concerns, and other distinguishing characteristics of such applications. An online form enables external parties to supply new exemplars for curation and inclusion into the repository. We envisage that our RoboMAX repository will enable the development, evaluation, and comparison of much-needed self-adaptation approaches for the robotic systems domain. [less ▲]

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See detailGerman Emigration and Remigration Panel Study (GERPS): Documentation of the Second Wave
Decieux, Jean Philippe Pierre UL; Witte, Nils; Erlinghagen, Marcel et al

Book published by Feder - BiB Daten- und Methodenberichte (2021)

International migration originating from highly developed countries is a crucial component of global migration flows. There are, however, surprisingly little data about the international mobility of the ... [more ▼]

International migration originating from highly developed countries is a crucial component of global migration flows. There are, however, surprisingly little data about the international mobility of the populations of affluent countries. The German Emigration and Remigration Panel Study (GERPS) aims to provide a resource that enables the analysis of individual consequences of international migration as well as the socio-structural consequences for the country of origin. GERPS is based on an origin-based multistage probability sample using the German population registers as a sampling frame. The second wave yields a net sample of roughly 7,000 persons who recently moved abroad from Germany and persons who returned from Germany after having lived abroad. The study follows a multidestination- country-design and enables the comparative analysis of migrants and nonmigrants, who stayed in the country of origin. GERPS is a panel study with at least four waves during a period of at least 24 months. This documentation presents the methods and data of the second wave. It provides information for researchers and invites them to use the new data infrastructure for their own research. [less ▲]

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See detailThe Dialectic of Transnational Integration and National Disintegration as Challenge for Multilevel Governance
Decieux, Jean Philippe Pierre UL

in Social Sciences (2021), 20(7),

A large number of studies have detected that within the EU multilevel governance there is a transformation toward a hybrid knowledge co-production that overcomes traditional categories such as locality or ... [more ▼]

A large number of studies have detected that within the EU multilevel governance there is a transformation toward a hybrid knowledge co-production that overcomes traditional categories such as locality or embeddedness. There, a sort of sustainable decision-making knowledge is co-developed and theoretically supposed to be applied top-down on the national level of EU member states. However, in practice such processes of unification are always associated with a risk of limited compliance with specific national situations and with a specific national “world of relevancies”. Despite the rise in popularity of these top-down initiatives within international policy levels, there is a lack of studies that empirically analyze how national policy systems respond to these global standardization approaches. Therefore, the central aim of this study is twofold: Based on an exemplary case of an international information system co-produced by an expert group of the European Commission, it first reconstructs whether and how transnational information is integrated on the national policy level. Second, it elucidates factors limiting an application. The results show that this international knowledge system was used for basal purposes and was mainly challenged by non-compliance with national specificities and the existence of alternative knowledge sources. [less ▲]

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See detailPersonality Traits and Self-Perceived Development of Friendship in the Course of Migration
Decieux, Jean Philippe Pierre UL

in Altmann, Tobias (Ed.) Friendship in Cultural and Personality Psychology: International Perspectives (2021)

Social bonds are important for individuals as bonds can have manifold positive impacts, such as emotional or practical support, and may be beneficial for individuals’ well-being or opportunities within ... [more ▼]

Social bonds are important for individuals as bonds can have manifold positive impacts, such as emotional or practical support, and may be beneficial for individuals’ well-being or opportunities within society. However, spatial mobility and especially international migration have the potential to diversify and destabilize people’s social bonds and may thus positively or negatively influence the impacts of social bonds. To date, there is a lot of research focussing on how migration affects partnership or family bonds, but there is a lack of research that places friendships at the core of the analysis. This is surprising, as friendships are a fundamental part of people’s system of social bonds. They can be seen as a key factor of social support in coping with stressful situations in everyday life, such as finding a place within the new host society, and are directly related to individual life satisfaction. Therefore, it is important to reflect on how situations in migrants’ circle of friends change in the course of migration. Using data from the first wave of the German Emigration and Remigration Panel Study (GERPS), in this chapter, I address this issue by focussing on self-perceived changes in the circle of friends in the course of international migration. The specific focus here is on how individual personality characteristics such as risk attitude, locus of control, or emotional attachment to the host and the home country (in case of this article Germany) are related to a positive or negative perception of the developments of emigrants’ circles of friends shortly after migration. As research on friendships suggests that specific sociodemographic groups differ in how they manage their networks, this chapter also considers gender- and age-specific perspectives. Results show that individual perceptions of the developments within the circle of friends in course of migration differ. Concerning the factors related to a positive or a negative perception of the development, it becomes apparent that the different personality attributes play a significant role. Concerning differences across sociodemographic groups, I found only slight differences between men and women but stronger differences across age groups. [less ▲]

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See detailThe Comprehensive Mindfulness Experience: A Typological Approach to the Potential Benefits of Mindfulness for Dealing with Motivational Conflicts
Grund, Axel UL; Senker, Kerstin; Dietrich, Julia et al

in Motivation Science (2021)

We wanted to address two critical limitations of research on mindfulness and motivational conflict, by (a) distinguishing between conflict experiences and conflict reactivity and (b) by applying a ... [more ▼]

We wanted to address two critical limitations of research on mindfulness and motivational conflict, by (a) distinguishing between conflict experiences and conflict reactivity and (b) by applying a typological approach, exploring natural combinations of two core qualities of (state) mindfulness: present moment awareness and a nonjudgmental stance. Using an experience-sampling (ES) design (N = 107 on the personal and 3862 at the observational level) with baseline and posttest measures of general affective wellbeing, we found that between-person differences in everyday conflict reactivity (i.e., perseverative and self-evaluative reactions toward conflict experiences) but not in conflict experiences per se (i.e., feeling that one wants to or should do something else) predicted impaired affective well-being after the ES period. Furthermore, multilevel latent profile analysis showed that momentary conflict reactivity was lowest when participants reported to be both momentarily aware and nonjudgmental, mirroring the comprehensive mindfulness experience. These effects existed while controlling for baseline and accompanying affect as well as for conflict intensity, strengthening the idea that motivational conflict itself is not a critical instance of self-regulation failure and that being mindful may contribute to remain functionally efficient and psychological well-adjusted. [less ▲]

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See detailNoradrenergic activation induced by yohimbine decreases interoceptive accuracy in healthy individuals with childhood adversity
Schulz, André UL; Deuter, Christian E.; Breden, Ion-Hideo et al

in Development and Psychopathology (2021)

Acute stress affects interoception, but it remains unclear if this is due to activation of the sympatho-adreno-medullary (SAM) or hypothalamicpituitary-adrenocortical axis. This study aimed to investigate ... [more ▼]

Acute stress affects interoception, but it remains unclear if this is due to activation of the sympatho-adreno-medullary (SAM) or hypothalamicpituitary-adrenocortical axis. This study aimed to investigate the effect of SAM axis activation on interoceptive accuracy (IAcc). Central alpha2-adrenergic receptors represent a negative feedback mechanism of the SAM axis. Major depressive disorder and adverse childhood experiences (ACE) are associated with alterations in the biological stress systems, including central alpha2-adrenergic receptors. Here, healthy individuals with and without ACE as well as depressive patients with and without ACE (n=114; all without antidepressant medication) were tested after yohimbine (alpha2-adrenergic antagonist) and placebo. We assessed IAcc and sensibility in a heartbeat counting task. Increases in systolic and diastolic blood pressure after yohimbine confirmed successful SAM axis activation. IAcc decreased after yohimbine only in the healthy group with ACE, but remained unchanged in all other groups (‘group’ × ‘drug’ interaction). This effect may be due to selective up-regulation of alpha2-adrenergic receptors after childhood trauma, which reduces capacity for attention focus on heartbeats. The sympathetic neural pathway including alpha2-adrenergic circuitries may be essential for mediating interoceptive signal transmission. Suppressed processing of physical sensations in stressful situations may represent an adaptive response in healthy individuals who experienced ACE. [less ▲]

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See detailSmartphone-based interventions for physical activity promotion: scoping review of the evidence over the last 10-years.
Domin, Alex UL; Spruijt-Metz, Donna; Theisen, Daniel UL et al

in Journal of Medical Internet Research (2021), 9(7), 24308

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See detailChanges in prevalence of cognitive impairment and associated risk factors 2000–2015 in São Paulo, Brazil
Ribeiro, Fabiana UL; Duarte, Yeda Aparecida de Oliveira; Santos, Jair Lício Ferreira et al

in BMC Geriatrics (2021)

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