.......................................................................................................................................... 132
8 Puentes y conectores ..................................................................................... 145
10 Obtención de ayuda.......................................................................................155
6
....................................................................................... 128
.........................................................................................................132
........................................................................................................ 134
.....................................................................................................137
....................................................................................................... 139
...........................................................................139
.............................................................................. 143
.................................................................................144
..................................................................................... 145
............................................................................................................ 146
................................................................................... 147
............................................................................................. 148
........................................................................ 148
...............................................................................151
............................................................................151
...................................................................................152
..........................................................................................153
.............................................................................................. 155
....................................................................... 155
.......................................... 126
..........................................................143
...................................................................149
....................................................................150
............................................................. 153
.................................. 156
................ 128
................ 130
................144