[dragonwriter]

A note on notation:

The standard notation for a cons cell with car "x" and cdr "y" is (x . y), not (x y). The latter is a list, equivalent of (x . (y . nil)).

So (1 2 3) is equivalent to (1 . (2 . (3 . nil)), not (1 (2 (3 nil))). The latter is a nested list, which is equivalent to (1 . ((2 . ((3 . (nil . nil)) . nil)) . nil))

[yjgyhj]

Good catch, thank you.

To anyone who wants to play around with lisp, I recommend downloading the emacs text editor. Just open it, navigate around with the arrow keys. Type an s-expression, and place the point after the ")". Then type Ctrl-x Ctrl-e, and the expression will be sent thru read -> eval -> apply. Fun to just play around with.

(+ 1 2)_ ;; _ means the cursor, ";" means a comment