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kouddy/SICP 2.32

Created April 12, 2015 14:13
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SICP 2.32
(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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