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filter! added by mdhughes on Fri Sep 13 16:26:16 2019

(import srfi-1)
(define a '(1 2 3 4 5 6))
(filter! even? a) ;; => (2 4 6)
a ;; expected (2 4 6), but got (1 2 4 6)
(define a '(1 2 3 4 5 6))
(filter even? a) ;; => (2 4 6)
a ;; => (1 2 3 4 5 6)
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What's the procedure that returns the car of a cdr?
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