Tabla de contenido
1 Introducción.......................................................................................................... 4
...........................................................................................................................................7
.....................................................................................................................................................10
.............................................................................................................................................. 18
.....................................................................................................................................................18
5 Obtención de ayuda...........................................................................................20
.......................................................................................................................... 4
.....................................................................................................................5
........................................................................................6
........................................................................................ 7
.......................................................................................................7
..........................................................................................................................15
.................................................................................................................... 15
..........................................................................................................................16
....................................................................................................................16
.......................................................................................................................18
................................................................................................ 20
......................................................................... 11
................................................................. 12
............................................................... 13
..............................................................................15
........................................................ 15
.............................................................. 16
...............................................................................20
3