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  1. (define (task lst r)
  2.   (if (null? lst) (reverse r)
  3.       (if (atom? (car lst)) (cons (car lst) (task (cdr lst) r))
  4.                             (task (cdr lst) (cons (car lst) r)))))
  5.  
  6. (display (task '(1 2 (1 2) 3 4 (5 6)) '()))
  7.  
Success #stdin #stdout 0s 7276KB
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Standard input is empty
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(1 2 3 4 (1 2) (5 6))
https://ideone.com/ZztLCd
language:
Scheme (chicken 4.13)
created:
9 years ago
visibility:
public

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