San Andr�s Tetepilco, Ciudad de M�xico, March 3rd, 2001. (L to R) Jos� Negrete, Jaime Lagunez, Pedro Pablo Gonz�lez, and Carlos Gershenson. At the party after the professional exam to obtain the degree of Computer Engineer by the last one. Curious fact: the people at the left of the picture are teachers of the people to the right of the picture, so I was student of my advisors, everyone was student of Jos� Negrete, and Pedro Pablo of Jaime.