Melissa Duff - Publications

Affiliations: 
Vanderbilt University, Nashville, TN 
Area:
memory, language, social interaction

92 high-probability publications. We are testing a new system for linking publications to authors. You can help! If you notice any innacuracies, please sign in and mark papers as correct or incorrect matches. If you identify any major omissions or other inaccuracies in the publication list, please let us know.

Year Citation  Score
2019 Warren DE, Duff MC. Fast mappers, slow learners: Word learning without hippocampus is slow and sparse irrespective of methodology. Cognitive Neuroscience. 1-3. PMID 30898013 DOI: 10.1080/17588928.2019.1593120  1
2019 Hilverman C, Brown-Schmidt S, Duff MC. Gesture height reflects common ground status even in patients with amnesia. Brain and Language. 190: 31-37. PMID 30677621 DOI: 10.1016/j.bandl.2018.12.008  0.76
2018 Rigon A, Duff MC, Beadle J. Lonely But Not Alone: Neuroticism Mediates the Relationship Between Social Network Size and Loneliness in Individuals With Traumatic Brain Injury. Journal of the International Neuropsychological Society : Jins. 1-8. PMID 30567616 DOI: 10.1017/S1355617718001108  0.68
2018 Byom L, Duff M, Mutlu B, Turkstra L. Facial emotion recognition of older adults with traumatic brain injury. Brain Injury. 1-11. PMID 30526138 DOI: 10.1080/02699052.2018.1553066  0.4
2018 Hengst JA, Duff MC, Jones TA. Enriching Communicative Environments: Leveraging Advances in Neuroplasticity for Improving Outcomes in Neurogenic Communication Disorders. American Journal of Speech-Language Pathology. 1-14. PMID 30453323 DOI: 10.1044/2018_AJSLP-17-0157  0.72
2018 Mutlu B, Duff M, Turkstra L. Social-cue perception and mentalizing ability following traumatic brain injury: A human-robot interaction study. Brain Injury. 1-9. PMID 30336070 DOI: 10.1080/02699052.2018.1531305  0.4
2018 Flynn MA, Mutlu B, Duff MC, Turkstra LS. Friendship Quality, Friendship Quantity, and Social Participation in Adults with Traumatic Brain Injury. Seminars in Speech and Language. PMID 30231267 DOI: 10.1055/s-0038-1670672  0.4
2018 Lucas HD, Duff MC, Cohen NJ. The Hippocampus Promotes Effective Saccadic Information Gathering in Humans. Journal of Cognitive Neuroscience. 1-16. PMID 30188777 DOI: 10.1162/jocn_a_01336  1
2018 Hilverman C, Clough S, Duff MC, Cook SW. Patients with hippocampal amnesia successfully integrate gesture and speech. Neuropsychologia. PMID 29932960 DOI: 10.1016/j.neuropsychologia.2018.06.012  0.6
2018 Rigon A, Voss MW, Turkstra LS, Mutlu B, Duff MC. WHITE MATTER CORRELATES OF DIFFERENT ASPECTS OF FACIAL AFFECT RECOGNITION IMPAIRMENT FOLLOWING TRAUMATIC BRAIN INJURY. Social Neuroscience. PMID 29902960 DOI: 10.1080/17470919.2018.1489302  0.68
2018 Rigon A, Reber J, Patel NN, Duff MC. Convergent thinking and traumatic brain injury: an investigation of performance on the remote associate test. Brain Injury. 1-5. PMID 29883201 DOI: 10.1080/02699052.2018.1483031  0.68
2018 Rigon A, Turkstra LS, Mutlu B, Duff MC. Facial-affect recognition deficit as a predictor of different aspects of social-communication impairment in traumatic brain injury. Neuropsychology. 32: 476-483. PMID 29809034 DOI: 10.1037/neu0000368  0.68
2018 Ryskin R, Qi Z, Covington NV, Duff M, Brown-Schmidt S. Knowledge and learning of verb biases in amnesia. Brain and Language. 180: 62-83. PMID 29775775 DOI: 10.1016/j.bandl.2018.04.003  1
2018 Rigon A, Voss MW, Turkstra LS, Mutlu B, Duff MC. Functional neural correlates of facial affect recognition impairment following TBI. Brain Imaging and Behavior. PMID 29737489 DOI: 10.1007/s11682-018-9889-x  0.68
2018 Rigon A, Voss MW, Turkstra LS, Mutlu B, Duff MC. Different aspects of facial affect recognition impairment following traumatic brain injury: The role of perceptual and interpretative abilities. Journal of Clinical and Experimental Neuropsychology. 1-15. PMID 29562838 DOI: 10.1080/13803395.2018.1437120  0.68
2018 Spalding KN, Schlichting ML, Zeithamova D, Preston AR, Tranel D, Duff MC, Warren DE. Ventromedial prefrontal cortex is necessary for normal associative inference and memory integration. The Journal of Neuroscience : the Official Journal of the Society For Neuroscience. PMID 29555854 DOI: 10.1523/JNEUROSCI.2501-17.2018  1
2018 Hilverman C, Cook SW, Duff MC. Hand gestures support word learning in patients with hippocampal amnesia. Hippocampus. PMID 29506316 DOI: 10.1002/hipo.22840  0.6
2018 Covington NV, Brown-Schmidt S, Duff MC. The Necessity of the Hippocampus for Statistical Learning. Journal of Cognitive Neuroscience. 1-20. PMID 29308986 DOI: 10.1162/jocn_a_01228  1
2017 Horecka KM, Dulas M, Schwarb H, Lucas H, Duff M, Cohen NJ. Reconstructing Relational Information. Hippocampus. PMID 29232494 DOI: 10.1002/hipo.22819  1
2017 Turkstra LS, Kraning SG, Riedeman SK, Mutlu B, Duff M, VanDenHeuvel S. Labelling Facial Affect in Context in Adults with and without TBI. Brain Impairment : a Multidisciplinary Journal of the Australian Society For the Study of Brain Impairment. 18: 49-61. PMID 29093643 DOI: 10.1017/BrImp.2016.29  0.4
2017 Hilverman C, Wagner Cook S, Duff MC. The influence of the hippocampus and declarative memory on word use: patients with amnesia use less imageable words. Neuropsychologia. PMID 28970108 DOI: 10.1016/j.neuropsychologia.2017.09.028  0.6
2017 Yoon SO, Duff MC, Brown-Schmidt S. Learning and using knowledge about what other people do and don't know despite amnesia. Cortex; a Journal Devoted to the Study of the Nervous System and Behavior. 94: 164-175. PMID 28768183 DOI: 10.1016/j.cortex.2017.06.020  0.76
2017 Turkstra LS, Duff MC, Politis AM, Mutlu B. Detection of text-based social cues in adults with traumatic brain injury. Neuropsychological Rehabilitation. 1-15. PMID 28594270 DOI: 10.1080/09602011.2017.1333012  0.4
2016 Covington NV, Duff MC. Expanding the Language Network: Direct Contributions from the Hippocampus. Trends in Cognitive Sciences. PMID 27814958 DOI: 10.1016/j.tics.2016.10.006  1
2016 Hilverman C, Cook SW, Duff MC. Hippocampal declarative memory supports gesture production: Evidence from amnesia. Cortex; a Journal Devoted to the Study of the Nervous System and Behavior. 85: 25-36. PMID 27810497 DOI: 10.1016/j.cortex.2016.09.015  0.6
2016 Brown-Schmidt S, Duff MC. Memory and Common Ground Processes in Language Use. Topics in Cognitive Science. PMID 27797165 DOI: 10.1111/tops.12224  0.76
2016 Ryskin RA, Qi Z, Duff MC, Brown-Schmidt S. Verb Biases Are Shaped Through Lifelong Learning. Journal of Experimental Psychology. Learning, Memory, and Cognition. PMID 27762578 DOI: 10.1037/xlm0000341  0.76
2016 Rigon A, Voss MW, Turkstra LS, Mutlu B, Duff MC. Frontal and Temporal Structural Connectivity Is Associated with Social Communication Impairment Following Traumatic Brain Injury. Journal of the International Neuropsychological Society : Jins. 1-12. PMID 27405965 DOI: 10.1017/S1355617716000539  0.68
2016 Rigon A, Turkstra L, Mutlu B, Duff M. The female advantage: sex as a possible protective factor against emotion recognition impairment following traumatic brain injury. Cognitive, Affective & Behavioral Neuroscience. PMID 27245826 DOI: 10.3758/s13415-016-0437-0  0.68
2016 Craver CF, Keven N, Kwan D, Kurczek J, Duff M, Rosenbaum RS. Moral Judgment in Episodic Amnesia. Hippocampus. PMID 27028169 DOI: 10.1002/hipo.22593  0.6
2016 Warren DE, Kurczek J, Duff MC. What relates newspaper, definite, and clothing? An article describing deficits in convergent problem solving and creativity following hippocampal damage. Hippocampus. PMID 27010751 DOI: 10.1002/hipo.22591  1
2016 Gordon RG, Duff MC. Incorporating principles of the collaborative contextualised intervention approach with the empirical study of learning and communication in traumatic brain injury Aphasiology. 1-22. DOI: 10.1080/02687038.2015.1136050  0.48
2015 Warren DE, Tranel D, Duff MC. Impaired acquisition of new words after left temporal lobectomy despite normal fast-mapping behavior. Neuropsychologia. PMID 26617264 DOI: 10.1016/j.neuropsychologia.2015.11.016  1
2015 Spalding KN, Jones SH, Duff MC, Tranel D, Warren DE. Investigating the Neural Correlates of Schemas: Ventromedial Prefrontal Cortex Is Necessary for Normal Schematic Influence on Memory. The Journal of Neuroscience : the Official Journal of the Society For Neuroscience. 35: 15746-51. PMID 26609165 DOI: 10.1523/JNEUROSCI.2767-15.2015  1
2015 Klooster NB, Duff MC. Remote semantic memory is impoverished in hippocampal amnesia. Neuropsychologia. 79: 42-52. PMID 26474741 DOI: 10.1016/j.neuropsychologia.2015.10.017  1
2015 Rigon A, Duff MC, Voss MW. Structural and functional neural correlates of self-reported attachment in healthy adults: evidence for an amygdalar involvement. Brain Imaging and Behavior. PMID 26334650 DOI: 10.1007/s11682-015-9446-9  1
2015 Gordon RG, Rigon A, Duff MC. Conversational synchrony in the communicative interactions of individuals with traumatic brain injury. Brain Injury. 1-9. PMID 26083049 DOI: 10.3109/02699052.2015.1042408  0.48
2015 Kurczek J, Wechsler E, Ahuja S, Jensen U, Cohen NJ, Tranel D, Duff M. Differential contributions of hippocampus and medial prefrontal cortex to self-projection and self-referential processing. Neuropsychologia. 73: 116-26. PMID 25959213 DOI: 10.1016/j.neuropsychologia.2015.05.002  1
2015 Rigon A, Duff MC, McAuley E, Kramer A, Voss MW. "Is traumatic brain injury associated with reduced inter-hemispheric functional connectivity? A study of large-scale resting state networks following traumatic brain injury". Journal of Neurotrauma. PMID 25719433 DOI: 10.1089/neu.2014.3847  0.68
2015 Duff MC, Stuck S. Paediatric concussion: Knowledge and practices of school speech-language pathologists. Brain Injury. 29: 64-77. PMID 25313854 DOI: 10.3109/02699052.2014.965747  1
2015 Derksen BJ, Duff MC, Weldon K, Zhang J, Zamba KD, Tranel D, Denburg NL. Older adults catch up to younger adults on a learning and memory task that involves collaborative social interaction. Memory (Hove, England). 23: 612-24. PMID 24841619 DOI: 10.1080/09658211.2014.915974  1
2015 Philippi CL, Tranel D, Duff M, Rudrauf D. Damage to the default mode network disrupts autobiographical memory retrieval. Social Cognitive and Affective Neuroscience. 10: 318-26. PMID 24795444 DOI: 10.1093/scan/nsu070  1
2014 Klooster NB, Cook SW, Uc EY, Duff MC. Gestures make memories, but what kind? Patients with impaired procedural memory display disruptions in gesture production and comprehension. Frontiers in Human Neuroscience. 8: 1054. PMID 25628556 DOI: 10.3389/fnhum.2014.01054  1
2014 Warren DE, Duff MC, Cohen NJ, Tranel D. Hippocampus contributes to the maintenance but not the quality of visual information over time. Learning & Memory (Cold Spring Harbor, N.Y.). 22: 6-10. PMID 25512572 DOI: 10.1101/lm.037127.114  1
2014 Rubin RD, Watson PD, Duff MC, Cohen NJ. The role of the hippocampus in flexible cognition and social behavior. Frontiers in Human Neuroscience. 8: 742. PMID 25324753 DOI: 10.3389/fnhum.2014.00742  1
2014 Warren DE, Jones SH, Duff MC, Tranel D. False recall is reduced by damage to the ventromedial prefrontal cortex: implications for understanding the neural correlates of schematic memory. The Journal of Neuroscience : the Official Journal of the Society For Neuroscience. 34: 7677-82. PMID 24872571 DOI: 10.1523/JNEUROSCI.0119-14.2014  1
2014 Gordon RG, Tranel D, Duff MC. The physiological basis of synchronizing conversational rhythms: the role of the ventromedial prefrontal cortex. Neuropsychology. 28: 624-30. PMID 24749726 DOI: 10.1037/neu0000073  1
2014 Warren DE, Duff MC. Not so fast: hippocampal amnesia slows word learning despite successful fast mapping. Hippocampus. 24: 920-33. PMID 24719218 DOI: 10.1002/hipo.22279  1
2014 Trude AM, Duff MC, Brown-Schmidt S. Talker-specific learning in amnesia: Insight into mechanisms of adaptive speech perception. Cortex; a Journal Devoted to the Study of the Nervous System and Behavior. 54: 117-23. PMID 24657480 DOI: 10.1016/j.cortex.2014.01.015  1
2014 Burin DI, Acion L, Kurczek J, Duff MC, Tranel D, Jorge RE. The role of ventromedial prefrontal cortex in text comprehension inferences: semantic coherence or socio-emotional perspective? Brain and Language. 129: 58-64. PMID 24561428 DOI: 10.1016/j.bandl.2013.12.003  1
2014 Buchanan TW, Laures-Gore JS, Duff MC. Acute stress reduces speech fluency. Biological Psychology. 97: 60-6. PMID 24555989 DOI: 10.1016/j.biopsycho.2014.02.005  1
2014 Yee LT, Warren DE, Voss JL, Duff MC, Tranel D, Cohen NJ. The hippocampus uses information just encountered to guide efficient ongoing behavior. Hippocampus. 24: 154-64. PMID 24123615 DOI: 10.1002/hipo.22211  1
2014 Buchanan TW, Laures-Gore JS, Duff MC. Corrigendum to "Acute stress reduces speech fluency" [Biol. Psychol. 97 (2014) 60-66] Biological Psychology. 100: 1. DOI: 10.1016/j.biopsycho.2014.04.004  1
2013 Duff MC, Kurczek J, Rubin R, Cohen NJ, Tranel D. Hippocampal amnesia disrupts creative thinking. Hippocampus. 23: 1143-9. PMID 24123555 DOI: 10.1002/hipo.22208  1
2013 Kurczek J, Brown-Schmidt S, Duff M. Hippocampal contributions to language: evidence of referential processing deficits in amnesia. Journal of Experimental Psychology. General. 142: 1346-54. PMID 23937178 DOI: 10.1037/a0034026  1
2013 Duff MC, Gallegos DR, Cohen NJ, Tranel D. Learning in Alzheimer's disease is facilitated by social interaction. The Journal of Comparative Neurology. 521: 4356-69. PMID 23881834 DOI: 10.1002/cne.23433  1
2013 Beadle JN, Tranel D, Cohen NJ, Duff MC. Empathy in hippocampal amnesia. Frontiers in Psychology. 4: 69. PMID 23526601 DOI: 10.3389/fpsyg.2013.00069  1
2012 Coronel JC, Duff MC, Warren DE, Federmeier KD, Gonsalves BD, Tranel D, Cohen NJ. Remembering and Voting: Theory and Evidence from Amnesic Patients. American Journal of Political Science. 56: 837-848. PMID 24511170 DOI: 10.1111/j.1540-5907.2012.00608.x  1
2012 Shune S, Duff MC. Verbal Play as an Interactional Discourse Resource in Early Stage Alzheimer's Disease. Aphasiology. 26: 811-825. PMID 23129879 DOI: 10.1080/02687038.2011.650626  1
2012 Kurczek J, Duff MC. Intact discourse cohesion and coherence following bilateral ventromedial prefrontal cortex. Brain and Language. 123: 222-7. PMID 23102898 DOI: 10.1016/j.bandl.2012.09.003  1
2012 Duff MC, Brown-Schmidt S. The hippocampus and the flexible use and processing of language. Frontiers in Human Neuroscience. 6: 69. PMID 22493573 DOI: 10.3389/fnhum.2012.00069  1
2012 Warren DE, Duff MC, Magnotta V, Capizzano AA, Cassell MD, Tranel D. Long-term neuropsychological, neuroanatomical, and life outcome in hippocampal amnesia. The Clinical Neuropsychologist. 26: 335-69. PMID 22401298 DOI: 10.1080/13854046.2012.655781  1
2012 Duff MC, Mutlu B, Byom L, Turkstra LS. Beyond utterances: distributed cognition as a framework for studying discourse in adults with acquired brain injury. Seminars in Speech and Language. 33: 44-54. PMID 22362323 DOI: 10.1055/s-0031-1301162  1
2012 Warren DE, Duff MC, Jensen U, Tranel D, Cohen NJ. Hiding in plain view: lesions of the medial temporal lobe impair online representation. Hippocampus. 22: 1577-88. PMID 22180166 DOI: 10.1002/hipo.21000  1
2012 Gupta R, Tranel D, Duff MC. Ventromedial prefrontal cortex damage does not impair the development and use of common ground in social interaction: implications for cognitive theory of mind. Neuropsychologia. 50: 145-52. PMID 22120006 DOI: 10.1016/j.neuropsychologia.2011.11.012  1
2012 Philippi CL, Duff MC, Denburg NL, Tranel D, Rudrauf D. Medial PFC damage abolishes the self-reference effect. Journal of Cognitive Neuroscience. 24: 475-81. PMID 21942762 DOI: 10.1162/jocn_a_00138  1
2012 Duff MC, Warren DE, Gupta R, Vidal JP, Tranel D, Cohen NJ. Teasing apart tangrams: testing hippocampal pattern separation with a collaborative referencing paradigm. Hippocampus. 22: 1087-91. PMID 21830250 DOI: 10.1002/hipo.20967  1
2011 Kurczek J, Duff MC. Cohesion, coherence, and declarative memory: Discourse patterns in individuals with hippocampal amnesia. Aphasiology. 25: 700-712. PMID 23136461 DOI: 10.1080/02687038.2010.537345  1
2011 Rubin RD, Brown-Schmidt S, Duff MC, Tranel D, Cohen NJ. How do I remember that I know you know that I know? Psychological Science. 22: 1574-82. PMID 22123775 DOI: 10.1177/0956797611418245  1
2011 Duff MC, Hengst JA, Gupta R, Tranel D, Cohen NJ. Distributed impact of cognitive-communication impairment: Disruptions in the use of definite references when speaking to individuals with amnesia. Aphasiology. 25: 675-687. PMID 22096266 DOI: 10.1080/02687038.2010.536841  1
2011 Warren DE, Duff MC, Tranel D, Cohen NJ. Observing degradation of visual representations over short intervals when medial temporal lobe is damaged. Journal of Cognitive Neuroscience. 23: 3862-73. PMID 21736458 DOI: 10.1162/jocn_a_00089  1
2011 Duff MC, Gupta R, Hengst JA, Tranel D, Cohen NJ. The use of definite references signals declarative memory: evidence from patients with hippocampal amnesia. Psychological Science. 22: 666-73. PMID 21474841 DOI: 10.1177/0956797611404897  1
2011 Gupta R, Duff MC, Tranel D. Bilateral amygdala damage impairs the acquisition and use of common ground in social interaction. Neuropsychology. 25: 137-46. PMID 21381821 DOI: 10.1037/a0021123  1
2010 Laures-Gore JS, DuBay MF, Duff MC, Buchanan TW. Identifying behavioral measures of stress in individuals with aphasia. Journal of Speech, Language, and Hearing Research : Jslhr. 53: 1394-400. PMID 20643788 DOI: 10.1044/1092-4388(2010/09-0236)  1
2010 Warren DE, Duff MC, Tranel D, Cohen NJ. Medial temporal lobe damage impairs representation of simple stimuli. Frontiers in Human Neuroscience. 4: 35. PMID 20508745 DOI: 10.3389/fnhum.2010.00035  1
2010 Feinstein JS, Duff MC, Tranel D. Sustained experience of emotion after loss of memory in patients with amnesia. Proceedings of the National Academy of Sciences of the United States of America. 107: 7674-9. PMID 20385824 DOI: 10.1073/pnas.0914054107  1
2010 Croft KE, Duff MC, Kovach CK, Anderson SW, Adolphs R, Tranel D. Detestable or marvelous? Neuroanatomical correlates of character judgments. Neuropsychologia. 48: 1789-801. PMID 20211193 DOI: 10.1016/j.neuropsychologia.2010.03.001  1
2010 Hengst JA, Duff MC, Dettmer A. Rethinking repetition in therapy: Repeated engagement as the social ground of learning Aphasiology. 24: 887-901. DOI: 10.1080/02687030903478330  1
2009 Duff MC, Hengst JA, Tranel D, Cohen NJ. Hippocampal amnesia disrupts verbal play and the creative use of language in social interaction. Aphasiology. 23: 926-939. PMID 20300442 DOI: 10.1080/02687030802533748  1
2009 Gupta R, Duff MC, Denburg NL, Cohen NJ, Bechara A, Tranel D. Declarative memory is critical for sustained advantageous complex decision-making. Neuropsychologia. 47: 1686-93. PMID 19397863 DOI: 10.1016/j.neuropsychologia.2009.02.007  1
2009 Duff MC. Management of sports-related concussion in children and adolescents Asha Leader. 14: 10-13.  1
2008 Duff MC, Hengst JA, Tengshe C, Krema A, Tranel D, Cohen NJ. Hippocampal amnesia disrupts the flexible use of procedural discourse in social interaction. Aphasiology. 22: 866-880. PMID 19234620 DOI: 10.1080/02687030701844196  1
2008 Konkel A, Warren DE, Duff MC, Tranel DN, Cohen NJ. Hippocampal amnesia impairs all manner of relational memory. Frontiers in Human Neuroscience. 2: 15. PMID 18989388 DOI: 10.3389/neuro.09.015.2008  1
2008 Proctor A, Yairi E, Duff MC, Zhang J. Prevalence of stuttering in African American preschoolers. Journal of Speech, Language, and Hearing Research : Jslhr. 51: 1465-79. PMID 18664698 DOI: 10.1044/1092-4388(2008/07-0057)  1
2008 Duff MC, Wszalek T, Tranel D, Cohen NJ. Successful life outcome and management of real-world memory demands despite profound anterograde amnesia. Journal of Clinical and Experimental Neuropsychology. 30: 931-45. PMID 18608659 DOI: 10.1080/13803390801894681  1
2008 Hengst JA, Duff MC, Prior PA. Multiple voices in clinical discourse and as clinical intervention. International Journal of Language & Communication Disorders / Royal College of Speech & Language Therapists. 43: 58-68. PMID 18432462 DOI: 10.1080/13682820701698093  1
2008 Duff MC, Hengst JA, Tranel D, Cohen NJ. Collaborative discourse facilitates efficient communication and new learning in amnesia. Brain and Language. 106: 41-54. PMID 18078671 DOI: 10.1016/j.bandl.2007.10.004  1
2007 Duff MC, Hengst JA, Tranel D, Cohen NJ. Talking across time: Using reported speech as a communicative resource in amnesia. Aphasiology. 21: 702716. PMID 18726006 DOI: 10.1080/02687030701192265  1
2007 Hengst JA, Duff MC. Clinicians as communication partners: Developing a mediated discourse elicitation protocol Topics in Language Disorders. 27: 37-49.  1
2006 Duff MC, Hengst J, Tranel D, Cohen NJ. Development of shared information in communication despite hippocampal amnesia. Nature Neuroscience. 9: 140-6. PMID 16341214 DOI: 10.1038/nn1601  1
2004 Duff MC, Proctor A, Yairi E. Prevalence of voice disorders in African American and European American preschoolers. Journal of Voice : Official Journal of the Voice Foundation. 18: 348-53. PMID 15331107 DOI: 10.1016/j.jvoice.2003.12.009  1
2002 Duff MC, Proctor A, Haley K. Mild traumatic brain injury (MTBI): assessment and treatment procedures used by speech-language pathologists (SLPs). Brain Injury. 16: 773-87. PMID 12217203 DOI: 10.1080/02699050210128870  1
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