|Parameters||l, a list|
|Purpose||Extracts the first element of a list.|
|Produces||The first element of the list.|
|Preconditions||One parameter (verified).|
l is a list (verified).
l is nonempty (verified).
|Postconditions||Does not affect l.|
> (car (cons 'a ())) a > (car (list 'c d e)) c > (car 'a) car: expects argument of type <pair>; given a > (car ()) car: expects argument of type <pair>; given ()
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