Primitive List-Manipulating Functions

> (setq x '(a b c d))

(A B C D)

> (first x) ; FIRST returns 1st elt of list

A

> (rest x) ; REST returns all but 1st.

(B C D)

> x

(A B C D) ; X has not been changed.

> (cons 'a 'b)

(A . B) ; CONS combines two things.

> (cons 'a nil)

(A) ; The result is often a list.

> (cons 'z x)

(Z A B C D)

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