So, we've been conducting a lot of research. And one of the things we were looking at is, if you can't read and write, if you want to communicate over distances, you need to be able to identify the person that you want to communicate with.
Hemos estudiado mucho el tema, y una de las cosas que observamos es que si no sabes leer ni escribir y te quieres comunicar a distancia, tienes que saber identificar a la persona con la que te quieres comunicar.