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|  | Front matter (pp. 0–2) |  |  | Editorial (p. 3) |  |  | Table of Contents (p. 5) |  | 1. | Carlos Natanael Lecona-Valdespino, Pablo Isaac Macias-Huerta, Rafael Cabañas-Rocha,  Guillermo Santamaría-Bonfil CARLA 0.9: Now with more Analytics! (pp. 7–15; abstract) |  | 2. | Jazmín Guadalupe Ramírez-Medina, María Lucila Morales-Rodríguez, Nelson Rangel-Valdez Model of Integration of Verbal and Nonverbal Expressions for Credible Virtual Agents (pp. 17–24; abstract) |  | 3. | Aldo Uriarte-Portillo, Luis Marcos Plata-Delgado, Ramón Zatarain-Cabada,  María Lucía Barrón-Estrada, Rosalío Zatarain-Cabada AR Application for Learning Electrical Circuits (pp. 25–33; abstract) |  | 4. | María del Pilar Meza Bucio, Gustavo Alfonso Gutiérrez Carreón Decision Tree-Based Model to Determine Student’s Dropout Factors  in a Mexican Higher Education Institution (pp. 35–41; abstract) |  | 5. | Alicia Martínez-Rebollar, Pedro Wences-Olguin, Gilberto Palacios-Gonzalez,  Hugo Estrada-Esquivel, Yasmin Hernandez-Perez Generation of Twitter Information Databases: A Case Study for the Mobility  of People Infected with COVID-19 (pp. 43–50; abstract) |  | 6. | José Medardo Tapia-Téllez, Aurelio López-López, Jesús Miguel García-Gorrostieta Training Readability Comparators for Academic Texts at Different Levels (pp. 51–58; abstract) |  | 7. | Mayra Mendoza, Yasmín Hernández, Javier Ortiz, Alicia Martínez, Hugo Estrada A Brief Review of Educational Data Mining to Improve Intelligent Learning Environments (pp. 59–67; abstract) |  |  | Back matter (p. 69) |  |