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;; Example 2.36
(define (accumulate op initial seq)
(if (null? seq)
(op (car seq)
(accumulate op initial (cdr seq)))))
(define (accumulate-n op init seqs)
(if (null? (car seqs))
(cons (accumulate op init (map car seqs))
(accumulate-n op init (map cdr seqs)))))
(define x (list (list 1 2 3) (list 4 5 6) (list 7 8 9) (list 10 11 12)))
(accumulate-n + 0 x)
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