Since combinations of car and cdr are frequently used, all combinations up to four uses of car and cdr are defined as functions of the form cxxxr:
(caar x) = (car (car x))
(cadr x) = (car (cdr x))
(caddr x) = (car (cdr (cdr x)))
Rule: The operations closer to the argument are done first.
It's worth memorizing some common combinations:
|car||=||first element of a list|
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