Thomas M. Smith

Computational Science

Author profile picture

Computational Science

tmsmith@sandia.gov

(505) 844-4241

Sandia National Laboratories, New Mexico
P.O. Box 5800
Albuquerque, NM 87185-1320

Biography

My research and development interests center around two major topics. The first is discretizations of PDEs for unstructured grids such as; finite element, finite volume and discontinuous Galerkin methods. The second topic is modeling and simulation fluid flows such as; incompressible, compressible, turbulent, reacting, wave propagation and MHD.

Education

  • Received a B.S. in Aerospace Engineering from the Pennsylvania State University,
  • M.S. in Aerospace Engineering from Georgia Institute of Technology,
  • PhD in Aerospace Engineering from Georgia Institute of Technology.
  • Thesis: "Unsteady Simulations of Turbulent Premixed Reacting Flows"

Publications

Nathaniel Donald Hamlin, Thomas M. Smith, Nicholas Roberds, Forrest Glines, Kristian Beckwith, (2022). Electrostatic Relativistic Fluid Models of Electron Emission in a Warm Diode IEEE Transactions on Plasma Science Document ID: 1585017

Nathaniel Donald Hamlin, Thomas M. Smith, Nicholas Roberds, Forrest Glines, Kristian Beckwith, (2022). Electrostatic Relativistic Fluid Models of Electron Emission in a Warm Diode 49th IEEE International Conference on Plasma Science Document ID: 1505803

Nathaniel Donald Hamlin, Thomas M. Smith, Nicholas Roberds, Kristian Beckwith, Forrest Glines, (2022). Electrostatic Relativistic Fluid Models of Electron Emission in a Warm Diode IEEE International Conference on Plasma Science 2022 Document ID: 1427332

John Davis Jakeman, Michael S. Eldred, Gianluca Geraci, Teresa Portone, Ahmad Rushdi, Daniel Thomas Seidl, Thomas M. Smith, (2021). Multi-fidelity Machine Learning Machine Learning and Deep Learning Conference https://www.osti.gov/search/identifier:1876608 Document ID: 1331137

Thomas M. Smith, Keith Cartwright, (2021). Using Diode Simulatons To Verify Of Plasma Physics Codes The 48th IEEE International Conference on Plasma Science Document ID: 1318495

Allen C. Robinson, Matthew Scot Swan, Thomas M. Smith, Nichelle Lee Bennett, Richard R. Drake, Russell Hooper, George Russell Laity, (2021). A Software Environment for Effective Reliability Management for Pulsed Power Design Reliability Engineering and System Safety https://www.osti.gov/search/identifier:1772945 Document ID: 1281068

John Davis Jakeman, Alex Gorodetsky, Michael S. Eldred, Gianluca Geraci, Thomas M. Smith, (2021). MFNETS: Multi-Fidelity Data-Driven Networks for Data Analysis MFNETSMulti-Fidelity Data-Driven Networks for Data Analysis https://www.osti.gov/search/identifier:1854429 Document ID: 1279900

George Russell Laity, Allen C. Robinson, Michael E. Cuneo, Mary Kathleen Alam, Kristian Beckwith, Nichelle Lee Bennett, Matthew Tyler Bettencourt, Stephen D Bond, Kyle Cochrane, Louise Criscenti, Eric Christopher Cyr, Karen June De Zetter, Richard R. Drake, Evstati Georgiev Evstatiev, Andrew Steven Fierro, Thomas Anthony Gardiner, Forrest Glines, Ronald S. Goeke, Nathaniel Donald Hamlin, Russell Hooper, Jason Koski, James Matthew Doyle Lane, Steven Robert Larson, Kevin Leung, Duncan Alisdair Odum McGregor, Philip Rocco Miller, Sean Miller, Susan Jasmin Ossareh, Edward Geoffrey Phillips, Sean Simpson, David Sirajuddin, Thomas M. Smith, Matthew Scot Swan, Aidan P. Thompson, Julien Guy Tranchida, Asa Jal Bortz-Johnson, Dale Robert Welch, Alex Moore Russell, Eric Duarte Watson, David Vincent Rose, Ryan D McBride, (2021). Towards Predictive Plasma Science and Engineering through Revolutionary Multi-Scale Algorithms and Models, Final Report https://www.osti.gov/search/identifier:1813907 Document ID: 1255312

John Davis Jakeman, Michael S. Eldred, Gianluca Geraci, Thomas M. Smith, Alex Gorodetsky, (2020). LDRD #218317: Learning Hidden Structure in Multi-Fidelity Information Sources for Efficient Uncertainty Quantification https://www.osti.gov/search/identifier:1668458 Document ID: 1196674

Thomas M. Smith, Kristian Beckwith, Nathaniel Donald Hamlin, Nicholas Roberds, (2020). Verification of EMPIRE Plasma Physics Codes Z Fundemental Science Workshop https://www.osti.gov/search/identifier:1812286 Document ID: 1183451

Jaideep Ray, Sarah Kieweg, Derek John Dinzl, Brian Carnes, V. Gregory Weirs, Brian Andrew Freno, Micah Andrew Howard, Thomas M. Smith, (2020). Estimation of Inflow Uncertainties in Laminar Hypersonic Double-Cone Experiments AIAA Journal https://www.osti.gov/search/identifier:1619241 Document ID: 1127683

Russell Hooper, Thomas M. Smith, Alex L. Robinson, J.N. Shadid, M.M. Crockatt, Sidney Shields, Charles Jason Moore, Matthew Scot Swan, (2020). Comparisons of Collisional Interactions Between Kinetic and Fluid Models External Advisory Board Meeting https://www.osti.gov/search/identifier:1770271 Document ID: 1103578

Sidafa Conde, Sibu Mabuza, John N. Shadid, Eric Christopher Cyr, Thomas M. Smith, Roger P. Pawlowski, (2019). On algebraic flux correction in continuous finite element schemes for problems in plasma physics Multimat https://www.osti.gov/search/identifier:1641928 Document ID: 1010027

Allen C. Robinson, Allen C. Robinson, Matthew Scot Swan, Matthew Scot Swan, Thomas M. Smith, Thomas M. Smith, Nichelle Lee Bennett, Nichelle Lee Bennett, Richard R. Drake, Richard R. Drake, Russell Hooper, Russell Hooper, (2019). Computational Infrastructure and Neutral Expansion Verification Problems for Testing Plasma Physics Algorithms Z Fundamental Science Workshop https://www.osti.gov/search/identifier:1641594 Document ID: 997902

Thomas M. Smith, T.D. Pointon, K.L. Cartwright, W.J. Rider, (2019). EMPIre-PIC Code Verification of a Cold Diode https://www.osti.gov/search/identifier:1762966 Document ID: 997943

Allen C. Robinson, Matthew Scot Swan, Richard R. Drake, Russell Hooper, Thomas M. Smith, Nichelle Lee Bennett, (2019). Neutral Expansion Exact Solutions for Plasma Code Verification 2019 International Conference on Numerical Simulation of Plasmas Document ID: 986237

Sibusiso Mabuza, John N. Shadid, Sidafa Conde, Eric Christopher Cyr, Thomas M. Smith, Roger P. Pawlowski, Dmitri Kuzmin, (2019). On AFC algorithms for continuous Galerkin discretization of MHD equations Seminar Mathematics Department, Clemson University https://www.osti.gov/search/identifier:1644856 Document ID: 948802

Sibusiso Mabuza, John N. Shadid, Eric Christopher Cyr, Thomas M. Smith, Dmitri Kuzmin, (2019). Stabilized continuous finite element schemes for problems in plasma physics 20th International Conference on Fluid Flow Problems https://www.osti.gov/search/identifier:1639628 Document ID: 948294

Sibusiso Mabuza, John N. Shadid, Eric Christopher Cyr, Thomas M. Smith, Dmitri Kuzmin, (2019). Stabilized continuous finite element schemes for problems in plasma physics Joint Mathematics Meetings https://www.osti.gov/search/identifier:1593213 Document ID: 902634

Sarah Kieweg, Jaideep Ray, V. Gregory Weirs, Brian Carnes, Derek John Dinzl, Brian Andrew Freno, Micah Andrew Howard, Eric T. Phipps, William J. Rider, Thomas M. Smith, (2019). Validation Assessment of Hypersonic Double-Cone Flow Simulations using UQ, Sensitivity Analysis, and Validation Metrics AIAA SciTech https://www.osti.gov/search/identifier:1592001 Document ID: 901745

Brian Carnes, Derek John Dinzl, Thomas M. Smith, V. Gregory Weirs, (2018). Code verification and numerical error estimation for use in model validation of laminar, hypersonic double-cone flows AIAA SciTech 2019 https://www.osti.gov/search/identifier:1761395 Document ID: 901887

Jaideep Ray, Sarah Kieweg, Derek John Dinzl, Brian Carnes, V. Gregory Weirs, Brian Andrew Freno, Micah Andrew Howard, Thomas M. Smith, I. Nompelis, G.V. Candler, (2018). Estimation of inflow uncertainties in laminar hypersonic double-cone experiments AIAA SciTech Forum https://www.osti.gov/search/identifier:1761392 Document ID: 901660

Sarah Kieweg, Jaideep Ray, V. Gregory Weirs, Brian Carnes, Derek John Dinzl, Brian Andrew Freno, Micah Andrew Howard, Eric T. Phipps, William J. Rider, Thomas M. Smith, Ioannis Nompelis, Graham Candler, (2018). Validation Assessment of Hypersonic Double-Cone Flow Simulations using Uncertainty Quantification, Sensitivity Analysis, and Validation Metrics AIAA SciTech https://www.osti.gov/search/identifier:1761106 Document ID: 900337

Jaideep Ray, Sarah Kieweg, Derek John Dinzl, Brian Carnes, V. Gregory Weirs, Brian Andrew Freno, Micah Andrew Howard, Thomas M. Smith, Ioannis Nompelis, G.V Candler, (2018). Estimation of inflow uncertainties in laminar hypersonic double-cone experiments AIAA SciTech Forum and Exposition https://www.osti.gov/search/identifier:1576878 Document ID: 889911

Sibusiso Mabuza, John N. Shadid, Dmitri Kuzmin, Eric Christopher Cyr, Thomas M. Smith, (2018). AFC Algorithms for Continuous FE for HD & MHD Caarms24 https://www.osti.gov/search/identifier:1570149 Document ID: 830597

Sarah Kieweg, Jaideep Ray, V. Gregory Weirs, Brian Carnes, Derek John Dinzl, Brian Andrew Freno, Micah Andrew Howard, William J. Rider, Thomas M. Smith, (2018). Uncertainty Quantification, Sensitivity Analysis, and Validation Assessment of Hypersonic Double-Cone Flow Simulations AIAA SciTech Forum Document ID: 808576

Sibusiso Mabuza, John N. Shadid, Eric Christopher Cyr, Thomas M. Smith, Dmitri Kuzmin, (2018). Algebraic flux correction algorithms in continuous FE schemes for HD & MHD Eccm-ecfd https://www.osti.gov/search/identifier:1526365 Document ID: 808556

Brian Carnes, V. Gregory Weirs, Thomas M. Smith, (2018). Code verification and numerical error estimation for use in model validation of laminar, hypersonic double-cone flows AIAA Science and Technology Forum https://www.osti.gov/search/identifier:1526350 Document ID: 808574

V. Gregory Weirs, Brian Carnes, Derek John Dinzl, Micah Andrew Howard, Sarah Kieweg, Jaideep Ray, William J. Rider, Thomas M. Smith, V. Gregory Weirs, (2018). A Validation Study for a Hypersonic Flow Model ASME Verification and Validation Symposium https://www.osti.gov/search/identifier:1515624 Document ID: 796864

Brian Carnes, Marco Arienti, Erin E. Mussoni, Brian Andrew Freno, V. Gregory Weirs, Thomas M. Smith, William J. Rider, (2018). Verification for Hypersonic, Reacting Turbulent Flow ASME Verification and Validation Symposium https://www.osti.gov/search/identifier:1513346 Document ID: 796810

Brian Carnes, Derek John Dinzl, Micah Andrew Howard, Sarah Kieweg, Jaideep Ray, William J. Rider, Thomas M. Smith, V. Gregory Weirs, (2018). A Validation Study for a Hypersonic Flow Model ASME Verification and Validation Symposium Document ID: 760623

Brian Carnes, Marco Arienti, Brian Andrew Freno, Erin E. Mussoni, V. Gregory Weirs, Thomas M. Smith, (2018). Verification for Hypersonic, Reacting Turbulent Flow ASME Verification and Validation Symposium 2018 https://www.osti.gov/search/identifier:1513654 Document ID: 749920

Matthias Mayr, John N. Shadid, Sibusiso Mabuza, Eric Christopher Cyr, Edward Geoffrey Phillips, Thomas M. Smith, (2018). Implicit-explicit (IMEX) ALE methods for time integration of multi-physics CFD simulations World Congress on Computational Mechanics Document ID: 738501

Thomas M. Smith, John N. Shadid, Eric Christopher Cyr, Roger P. Pawlowski, Timothy Michael Wildey, (2016). Stabilized FE Simulation of Prototype Thermal-Hydraulics Problems with Integrated Adjoint-based Capabilities for %Error-estimation, Sensitivity Analysis and UQ Journal of Computational Physics https://www.osti.gov/search/identifier:1338379 Document ID: 207904

Thomas M. Smith, Mark A. Christon, Emilio Baglietto, Hong Luo, (2016). Assessment of Models for Near Wall Behavior and Swirling Flows in Nuclear Reactor Sub-system Simulations 15th European Turbulence Conference https://www.osti.gov/search/identifier:1576185 Document ID: 220208

Thomas M. Smith, (2016). Full System Scale Simulations of Reactor Cores Enabled by ExaScale Computing DOE ASCR Turbulent Flow Simulation at the ExascaleOpportunities and Challenges Workshop https://www.osti.gov/search/identifier:1413429 Document ID: 319308

William Spotz, Irina Kalashnikova Tezaur, Peter Andrew Bosler, Jeffrey A. Fike, Oksana Guba, Thomas M. Smith, Jerry Watkins, Irina Demeshko, (2016). Aeras: A Performance Portable, High-Resolution Global Atmosphere Model American Geophysical Union https://www.osti.gov/search/identifier:1413413 Document ID: 565509

Curtis C. Ober, Thomas M. Smith, James R. Overfelt, Samuel Scott Collis, Gregory John von Winckel, Bart G van Bloemen Waanders, Nathan John Downey, Scott A. Mitchell, Stephen D Bond, David F. Aldridge, Jerome R. (ExxonMobil) Krebs, (2016). Visco-TTI-Elastic FWI using Discontinuous Galerkin Society of Exploration Geophysicists 86th Annual Meeting https://www.osti.gov/search/identifier:1400043 Document ID: 531480

Jerome R. (ExxonMobil) Krebs, Curtis C. Ober, Thomas M. Smith, James R. Overfelt, Samuel Scott Collis, Gregory John von Winckel, Bart G van Bloemen Waanders, Nathan John Downey, David F. Aldridge, (2016). Synthetic study of raw-data FWI applied to visco-TTI-elastic data Society of Exploration Geophysicists 86th Annual Meeting https://www.osti.gov/search/identifier:1400042 Document ID: 530887

Peter Andrew Bosler, Steven W. Bova, Irina P. Demeshko, Jeffrey A. Fike, Oksana Guba, James R. Overfelt, Erika Louise Roesler, Andrew G. Salinger, Thomas M. Smith, Irina Kalashnikova Tezaur, Jerry Watkins, (2016). The Aeras Next Generation Global Atmosphere Model https://www.osti.gov/search/identifier:1562816 Document ID: 531074

Curtis C. Ober, Thomas M. Smith, James R. Overfelt, Samuel Scott Collis, Gregory John von Winckel, Bart G van Bloemen Waanders, Nathan John Downey, Scott A. Mitchell, Stephen D Bond, David F. Aldridge, Jerome R. (ExxonMobil) Krebs, (2016). Visco-TTI-Elastic FWI using Discontinuous Galerkin Society of Exploration Geophysicists 86th Annual Meeting Document ID: 430469

Jerome R. (ExxonMobil) Krebs, Curtis C. Ober, Thomas M. Smith, James R. Overfelt, Samuel Scott Collis, Gregory John von Winckel, Bart G van Bloemen Waanders, Nathan John Downey, David F. Aldridge, (2016). Synthetic study of raw-data FWI applied to visco-TTI-elastic data Society of Exploration Geophysicists 86th Annual Meeting Document ID: 430471

Thomas M. Smith, Markus Berndt, Emilio Baglietto, Ben Magolan, (2015). A Multi-Year Plan for Enhancing Turbulence Modeling in Hydra-TH Revised and Updated Version 2.0 https://www.osti.gov/search/identifier:1223059 Document ID: 342180

Thomas M. Smith, Mark A. Christon, Emilio Baglietto, (2015). Assessment of Models for Near Wall Behavior and Swirling Flows in Nuclear Reactor Sub-systems European Turbulence Conference 15 https://www.osti.gov/search/identifier:1307281 Document ID: 320144

William Spotz, Irina Demeshko, Thomas M. Smith, Jeffrey A. Fike, (2015). Aeras: A Next Generation Atmosphere Model International Conference on Computational Science https://www.osti.gov/search/identifier:1248670 Document ID: 244078

D. L. Sondak, John N. Shadid, A. A. Oberai, Roger P. Pawlowski, Eric Christopher Cyr, Thomas M. Smith, (2014). A new class of finite element variational multiscale turbulence models for incompressible magnetohydrodynamics Journal of Computational Physics https://www.osti.gov/search/identifier:1185020 Document ID: 219035

Thomas M. Smith, Murat Okandan, Carol I. Ashby, Terry A. Michalske, C. M. MATZKE, (2014). MEMS in Microfluidic Channels https://www.osti.gov/search/identifier:918744 Document ID: 5220882

Curtis C. Ober, Thomas M. Smith, Bart G van Bloemen Waanders, Samuel Scott Collis, (2014). Large Scale Optimization for Non-Invasive Testing With Discontinuous Galerkin Methods 11th. World Congress on Computational Mechanics (WCCM2014) https://www.osti.gov/search/identifier:1496527 Document ID: 132605

John N. Shadid, Timothy Michael Wildey, Roger P. Pawlowski, Thomas M. Smith, (2013). Error Estimation with Adjoints in Drekar: Applications to Fluid Flow and Magnetohydrodynamics Models CIS External Review https://www.osti.gov/search/identifier:1661289 Document ID: 5322141

Eric Christopher Cyr, John N. Shadid, Thomas M. Smith, Roger P. Pawlowski, (2013). A Comparison of Adjoint and Data-Centric Verification Techniques https://www.osti.gov/search/identifier:1095937 Document ID: 5320913

Roger P. Pawlowski, Eric Christopher Cyr, John N. Shadid, Thomas M. Smith, Stuart Slattery, Paul Wilson, Kevin Clarno, Roscoe Bartlett, Steve Hamilton, Tom Evans, (2013). Multiphysics Coupling Tools Applied to Large-scale Simulations of a Light Water Nuclear Reactor Core 2013 SIAM Conference on Computational Science and Engineering https://www.osti.gov/search/identifier:1067750 Document ID: 5319536

Eric Christopher Cyr, John N. Shadid, Thomas M. Smith, (2012). Adjoint Based a posteriori Error Estimation in Drekar::CFD https://www.osti.gov/search/identifier:1055892 Document ID: 5314462

Roger P. Pawlowski, John N. Shadid, Thomas M. Smith, Timothy Michael Wildey, (2011). Embedded UQ and QoI/Adjoints in Drekar: New Directions CASL THM Worksthop https://www.osti.gov/search/identifier:1113265 Document ID: 5302648

Roger P. Pawlowski, Eric Christopher Cyr, John N. Shadid, Thomas M. Smith, (2011). Building an Open-source Multiphysics PDE Research Tool using Trilinos Trilinos User Group Meeting https://www.osti.gov/search/identifier:1118462 Document ID: 5301402

Mark W. Jenkins, Thomas M. Smith, Samuel Scott Collis, (2011). A "Gaussian Explosion" Seismic Energy Source Society of Exploration Geophysicists Annual International Meeting https://www.osti.gov/search/identifier:1288757 Document ID: 5298774

John N. Shadid, Thomas M. Smith, Eric Christopher Cyr, (2011). Scalable Stabilized FE Formulations for Simulating Turbulent Reacting Flows in Light Water ReactorsTurbulent Reacting Flows in Light Water Reactors 11th US Congress on Computational Mechanics https://www.osti.gov/search/identifier:1120245 Document ID: 5297243

Samuel Scott Collis, Curtis C. Ober, James R. Overfelt, Thomas M. Smith, Joseph G Young, (2011). Large Scale Inversion using a Discontinuous Galerkin Method for Geophysics SIAM Computational Science and Engineering https://www.osti.gov/search/identifier:1109159 Document ID: 5292163

Michael P. Desjarlais, Gary L. Hennigan, Roger P. Pawlowski, Eric T. Phipps, John N. Shadid, Lawrence Musson, Thomas M. Smith, Eric R. Keiter, Deborah Fixel, (2008). High Fidelity Simulation for Semiconductor Electrical Devices in Extreme Environments SC08 Supercomputing Conference https://www.osti.gov/search/identifier:1142722 Document ID: 5267362

Thomas M. Smith, James Alan Voigt, David Tallant, Jessica E. Bickel, Carolyn M. Matzke, (2007). Time-Resolved Monitoring of CdS Nanocrystal Synthesis in a Microfluidic Reactor Nano Letters https://www.osti.gov/search/identifier:952781 Document ID: 5222824

Thomas M. Smith, Bonnie B. McKenzie, Erik David Spoerke, James Alan Voigt, Jun Liu, (2007). Galactic Nanostructures MRS Spring Meeting https://www.osti.gov/search/identifier:1145156 Document ID: 5232731

Thomas M. Smith, Paul A. Safier, James C. Baygents, (2007). Theory and Simulation of Isoelectric Focusing https://www.osti.gov/search/identifier:1145156 Document ID: 5227657

Curtis C. Ober, Thomas M. Smith, Steven W. Bova, (2007). Use of a Manufactured Solution for Verifying CFD Flux Schemes and BCs SIAM Conference on Computational Science and Engineering https://www.osti.gov/search/identifier:1143347 Document ID: 5249647

Russell Hooper, Thomas M. Smith, Curtis C. Ober, (2007). Enabling Fluid-Structural Strong Thermal Coupling Within a Multi-Physics Environment AIAA Annual Meeting https://www.osti.gov/search/identifier:902570 Document ID: 5239028

Russell Hooper, Thomas M. Smith, Curtis C. Ober, (2007). Enabling Fluid-Structural Strong Thermal Coupling Within a Multi-Physics Environment American Institute of Aeronautics and Astronautics https://www.osti.gov/search/identifier:900036 Document ID: 5239004

Thomas M. Smith, James Alan Voigt, Julia W. P. Hsu, Erik David Spoerke, Zhengrong Tian, Yingbing Jiang, (2006). Sequential Nucleation and Growth of Complex Nanostructured Films Advanced Materials https://www.osti.gov/search/identifier:886907 Document ID: 5234360

George A Samara, Samuel Scott Collis, Eric R. Keiter, Curtis C. Ober, Thomas M. Smith, Volkan Akcelik, Omar Ghattas, Judith Hill, Martin Berggren, Matthias Heinkenschloss, Lucas Wilcox, (2005). Sensitivity Technologies for Large Scale Simulation https://www.osti.gov/search/identifier:921606 Document ID: 5228150

Rodney C. Schmidt, Thomas M. Smith, Paul E DesJardin, Thomas E. Voth, Mark Allen Christon, Alan R. Kerstein, Scott E. Wunsch, (2002). On the Development of the Large Eddy Simulation Approach for Modeling Turbulent Flow: LDRD Final Report https://www.osti.gov/search/identifier:800791 Document ID: 4228100

Christopher J. Roy, Thomas M. Smith, Curtis C. Ober, (2002). Verification of a Compressible CFD Code Using the Method of Manufactured Solutions 32nd AIAA Fluid Dynamics Conference https://www.osti.gov/search/identifier:800791 Document ID: 4363600

John N. Shadid, Thomas M. Smith, Gary L. Hennigan, Andrew G. Salinger, Roger P. Pawlowski, Curtis C. Ober, (2002). Stabilized Finite Element Simulations of Large-Scale Reacting Flow Applications 9th International Conference on Numerical Combustion https://www.osti.gov/search/identifier:800791 Document ID: 4259500

Alfred Lorber, Curtis C. Ober, Thomas M. Smith, Steven N. Kempka, (2002). Premo Development Status https://www.osti.gov/search/identifier:800791 Document ID: 4396000

Darin Lynn George, Thomas M. Smith, Christopher J. Roy, (2001). Numerical Simulations of a Methanol Pool Fire 39th AIAA Aerospace Sciences Meeting and Exhibit https://www.osti.gov/search/identifier:800791 Document ID: 3804600

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