1. Department of Computer Science, Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis Enrique Erro 1, Puebla, México
2. Research in Text Understanding and Analysis of Language Lab, University of Houston, Houston, TX, USA
3. Language and Reasoning Research Group, Department of Information Technologies, Universidad Autónoma Metropolitana, Unidad Cuajimalpa (UAM-C), Ciudad de México, México