A cons is a compound data object having two components called the car and the cdr.
car cons rplacd cdr rplaca
Figure 14-1. Some defined names relating to conses.
Depending on context, a group of connected conses can be viewed in a variety of different ways. A variety of operations is provided to support each of these various views.
14.1.1 Conses as Trees
14.1.2 Conses as Lists