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Singh,M.; Singh,M.; Sharma, A. K.; Krishna B. A. |
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Title |
Methodological considerations in measurement of dominance in primates |
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Journal Article |
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2003 |
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CURRENT SCIENCE |
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CURRENT SCIENCE |
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84 |
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5 |
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709-713 |
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The strength of dominance hierarchy in a group of
animals needs to be quantitatively measured since it
influences many other aspects of social interactions.
This article discusses three attempts made by previous
researchers to measure the strength of hierarchy. We
propose a method which attempts to rectify the lacunae
in the previous attempts. Data are used from a
group of Japanese macaques housed in a colony. A
method to calculate strength of hierarchy has been
illustrated and a procedure has been suggested to
normalize the dominance scores in order to place the
ranks of individuals on an interval scale. |
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Biopsychology Laboratory, Department of Psychology, University of Mysore, Mysore 570 006, India |
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Equine Behaviour @ team @ |
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2860 |
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Author |
Simpson, B.S. |
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Title |
Neonatal foal handling |
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Journal Article |
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Year |
2002 |
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Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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78 |
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2-4 |
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303-317 |
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Neonatal foal handling; Imprint training; Learning in foals; Heart rate; Serum cortisol concentrations |
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Recent interest has focused on the advantage of intensively handling young foals as a means of producing more tractable horses, accustomed to humans and receptive to training. To date, the effect of this intensive handling, dubbed “imprint training” in the popular literature, has not been tested. The present study compares seven foals handled intensively as neonates with eight untreated controls. The handling protocol started from 2-8 h after birth and continued daily for a total of 5 days. The protocol consisted of a series of stimuli and experiences that were each repeated until the foal no longer resisted or reacted negatively. Subsequently, foals were tested before weaning, at 4 months of age. Results indicated that handled foals (HF) ranked higher than control foals (CF) in subjective ratings of calmness (*P<0.0117) and friendliness (*P<0.0001) and in several specific handling tasks (venipuncture *P<0.0220; placing in stock *P<0.0128). Although, in approach tests all foals but one allowed approach of a person to 4 m, significantly more HF approached the person than CF (P<0.0080). In stimulus tests, foals were presented specific stimuli to which they had been tested as neonates. Two of eight CF were too unruly and dangerous to test. Of foals that could be tested, CF required significantly more time to hook-up a heart rate monitor (**P<0.0055). Split-plot analysis indicated that HF had lower heart rates to initial left-sided stimuli, presented first, than CF (*P<0.0421). In response to right-sided stimuli, heart rate scores of CF were not significantly different from HF (P<0.2259), suggesting reduced reactivity over time due to a learning effect. Behavioral responses to specific stimuli did not differ between CF and HF, suggesting that neonatal handling has a general rather than specific effect on subsequent behavior. Cortisol concentrations were measured before and after testing and the difference calculated. All foals had higher post-testing levels than pre-testing levels. There was a significant difference between HF and CF, indicating greater reactivity among the CF (*P<0.050). In general, the results indicated that foals handled as neonates were more tractable and less reactive. Specific neonatal handling tasks, such as sticking a finger up the foal's nose or patting the bottom of the foot, seemed to have no beneficial effect on related tasks such as passing a nasogastric tube or tapping with a farrier's hammer at 4 months of age. Mechanisms for the observed effect of neonatal handling require further investigation. |
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Equine Behaviour @ team @ |
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3623 |
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Silk, J.B.; Alberts, S.C.; Altmann, J. |
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Title |
Social Bonds of Female Baboons Enhance Infant Survival |
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Journal Article |
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Year |
2003 |
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Science |
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Science |
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302 |
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5648 |
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1231-1234 |
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Among nonhuman primates, females often form strong bonds with kin and other group members. These relationships are thought to have adaptive value for females, but direct effects of sociality on fitness have never been demonstrated. We present 16 years of behavioral data from a well-studied population of wild baboons, which demonstrate that sociality of adult females is positively associated with infant survival, an important component of variation in female lifetime fitness. The effects of sociality on infant survival are independent of the effects of dominance rank, group membership, and environmental conditions. Our results are consistent with the evidence that social support has beneficial effects on human health and well-being across the life span. For humans and other primates, sociality has adaptive value. |
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10.1126/science.1088580 |
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Equine Behaviour @ team @ |
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5151 |
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Author |
Silk, J.B. |
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Title |
Social Components of Fitness in Primate Groups |
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Journal Article |
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2007 |
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Science |
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Science |
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317 |
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5843 |
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1347-1351 |
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There is much interest in the evolutionary forces that favored the evolution of large brains in the primate order. The social brain hypothesis posits that selection has favored larger brains and more complex cognitive capacities as a means to cope with the challenges of social life. The hypothesis is supported by evidence that shows that group size is linked to various measures of brain size. But it has not been clear how cognitive complexity confers fitness advantages on individuals. Research in the field and laboratory shows that sophisticated social cognition underlies social behavior in primate groups. Moreover, a growing body of evidence suggests that the quality of social relationships has measurable fitness consequences for individuals. |
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10.1126/science.1140734 |
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Equine Behaviour @ team @ |
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4239 |
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Sigurjonsdottir, H. |
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Title |
How does group stability and composition affect interactions in horse groups? |
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Conference Article |
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2012 |
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Proceedings of the 2. International Equine Science Meeting |
Abbreviated Journal |
Proc. 2. Int. Equine. Sci. Mtg |
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in press |
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Results from studies on the social behaviour of the Icelandic horse kept in different types of groups will be presented. Most groups were studied for more than 75 hours. The groups vary in composition and in stability. Some groups include stallions (6 groups) while others breeding mares and foals (1), geldings, mares, sub-adults and foals (3), geldings, sub-adults and mares (2), geldings and mares (4), one-sex 1year olds (3) and sub-adults (1). In some of the groups the residency of individual horses was similar (stable groups) while in others the composition changed frequently or unfamiliar horses were all put together at the same time. The results show that both negative and positive interactions are more frequent in unstable groups. Also, interesting differences emerged when different group types were compared. The results are important for management and will be discussed in that context. KW - |
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Sigurjonsdottir, H. |
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Xenophon Publishing |
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Wald |
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Krueger, K. |
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978-3-9808134-26 |
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Equine Behaviour @ team @ |
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5535 |
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Siegel, J.M. |
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Title |
Do all animals sleep? |
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Journal Article |
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2008 |
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Trends in Neurosciences |
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31 |
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4 |
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208-213 |
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Some animals never exhibit a state that meets the behavioral definition of sleep. Others suspend or greatly reduce ‘sleep’ behavior for many weeks during the postpartum period or during seasonal migrations without any consequent ‘sleep debt.’ Rats die from one form of sleep deprivation, but sleep loss has not been shown to cause death in well-controlled studies in other vertebrate species. Some marine mammal species do not show evidence for REM sleep, and convincing evidence for this state in reptiles, fish and insects is lacking. The enormous variation in the nature of rest and sleep states across the animal kingdom and within the mammalian class has important implications for understanding the evolution and functions of sleep. |
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0166-2236 |
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Equine Behaviour @ team @ |
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5613 |
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Sibbald, A.M.; Elston, D.A.; Smith, D.J.F.; Erhard, H.W. |
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A method for assessing the relative sociability of individuals within groups: an example with grazing sheep |
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Journal Article |
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2005 |
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Applied Animal Behaviour Science |
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Appl. Anim. Behav. Sci. |
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91 |
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1-2 |
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57-73 |
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Association; Grazing; Nearest neighbour; Sheep; Sociability; Social behaviour |
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We describe a method for quantifying relative sociability within a group of animals, which is defined as the tendency to be close to others within the group and based on the identification of nearest neighbours. The method is suitable for groups of animals in which all individuals are visible and identifiable and has application as a tool in other areas of behavioural research. A sociability index (SI) is calculated, which is equivalent to the relative proportion of time that an individual spends as the nearest neighbour of other animals in the group and is scaled to have an expectation of 1.0 under the null hypothesis of random mixing. Associated pairs, which are animals seen as nearest neighbours more often than would be expected by chance, are also identified. The method tests for consistency across a number of independent observation periods, by comparison with values obtained from simulations in which animal identities are randomised between observation periods. An experiment is described in which 8 groups of 7 grazing sheep were each observed for a total of 10, one-hour periods and the identities and distances away of the 3 nearest neighbours of each focal animal recorded at 5-min intervals. Significant within-group differences in SIs were found in four of the groups (P < 0.001). SIs calculated using the nearest neighbour, two nearest neighbours or three nearest neighbours, were generally highly correlated within all groups, with little change in the ranking of animals. There were significant negative correlations between SIs and nearest neighbour distances in five of the groups. It was concluded that there was no advantage in recording more than one neighbour to calculate the SI. Advantages of the SI over other methods for measuring sociability and pair-wise associations are discussed. |
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refbase @ user @ |
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317 |
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Shultz, S.; Dunbar, R.I.M. |
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Both social and ecological factors predict ungulate brain size |
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2006 |
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Proceedings. Biological Sciences / The Royal Society |
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Proc Biol Sci |
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273 |
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1583 |
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207-215 |
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Animals; Artiodactyla/*anatomy & histology/*physiology; Brain/*anatomy & histology/physiology; *Ecosystem; Organ Size; Perissodactyla/*anatomy & histology/*physiology; *Social Behavior |
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Among mammals, the members of some Orders have relatively large brains. Alternative explanations for this have emphasized either social or ecological selection pressures favouring greater information-processing capacities, including large group size, greater foraging efficiency, higher innovation rates, better invasion success and complex problem solving. However, the focal taxa for these analyses (primates, carnivores and birds) often show both varied ecological competence and social complexity. Here, we focus on the specific relationship between social complexity and brain size in ungulates, a group with relatively simple patterns of resource use, but extremely varied social behaviours. The statistical approach we used, phylogenetic generalized least squares, showed that relative brain size was independently associated with sociality and social complexity as well as with habitat use, while relative neocortex size is associated with social but not ecological factors. A simple index of sociality was a better predictor of both total brain and neocortex size than group size, which may indicate that the cognitive demands of sociality depend on the nature of social relationships as well as the total number of individuals in a group. |
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School of Biological Sciences, University of Liverpool, Biosciences Building, Crown Street, Liverpool L69 7ZB, UK. susanne.shultz@liv.ac.uk |
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0962-8452 |
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PMID:16555789 |
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2098 |
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Author |
Shultz, S. |
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Are equid brains social? Exploring the evolution of equid social structure and social intelligence |
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Conference Article |
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2012 |
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Proceedings of the 2. International Equine Science Meeting |
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Proc. 2. Int. Equine. Sci. Mtg |
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in press |
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The living equids display a variety of different forms of social organisation; plains (Equus quagga) and mountain zebra (Equus zebra) associate in small, closed harems, whereas the asses and Grevy’s zebra (Equus grevyi) are found in looser, more ephemeral associations. Feral domestic horses appear to be somewhat intermediate: although stallions generally maintain harems, there is some movement of individuals between groups. This talk will use several statistical approached to explore evolutionary explanations for these differences. Firstly, we will explore the relationship between brain architecture and social organisation both among the equids and across all Perissodactyls. Equids have larger relative neocortices than other Perissodactyls; within the equids, species typically found in more stable groups have larger neocortices than equids in more unstable ephemeral groups. The strong relationship between group stability and brain size and architecture mirrors that found in other mammals, including primates. Thus, living in stable social groups consistently appears to impose cognitive demands across species. In order to understand the historical trajectory resulting in the relatively large, social brains found in some species, we then reconstruct the evolutionary pathway of social living in the equids. Finally, we discuss how we can use network theory to measure social structure and how these differences may impose different cognitive demands on individuals. |
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social brain hypothesis, Bayesian modelling, social networks, brain size, social evolution |
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Corporate Author |
Shultz, S. |
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Xenophon Publishing |
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Wald |
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Krueger, K. |
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978-3-9808134-26 |
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Equine Behaviour @ team @ |
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5557 |
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Author |
Shettleworth, S.J. |
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Foraging, memory, and constraints on learning |
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1985 |
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Annals of the New York Academy of Sciences |
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Ann N Y Acad Sci |
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443 |
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216-226 |
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Animals; Animals, Wild; *Appetitive Behavior; *Avoidance Learning; Birds; *Conditioning, Classical; Discrimination Learning; Food Preferences; *Memory; *Mental Recall; Motivation; *Predatory Behavior; Rats; *Taste |
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0077-8923 |
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PMID:3860072 |
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refbase @ user @ |
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384 |
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