/usr/lib/s9fes/help/car is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 | R4RS 6.3 (car pair) ==> object
Returns the contents of the car field of PAIR. Note that it is an
error to take the car of the empty list.
(car '(a b c)) ==> a
(car '((a) b c d)) ==> (a)
(car '(1 . 2)) ==> 1
(car '()) ==> error
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