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Primitive Functions (cont.)

3. CAR takes a list parameter; returns the first element of that list

    (car '(a b c))        yields    a
    (car '((a b) c d))    yields    (a b)

4. CDR takes a list parameter; returns the list after removing its first element

    (cdr '(a b c))        yields    (b c)
    (cdr '((a b) c d))    yields    (c d)