Created
April 12, 2015 14:13
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| (define (subsets s) | |
| (if (null? s) | |
| (list null) | |
| (let ((rest (subsets (cdr s)))) | |
| (append rest ;;; append is like + for list | |
| (map (lambda (l) (cons (car s) l)) rest))))) |
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