CAR, CDR, and their combinations

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

(A B C D)

> (car x)

A ; CAR is equivalent to FIRST

> (rest x)

(B C D) ; CDR is equivalent to REST.

> (cdr (cdr x))

(C D)

> (cddr x)

(C D)

> (caddr x)

C ; CADDR is equivalent to THIRD

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