#| BEGIN (Введите свое решение) |#
(define (enumerate-interval low high)
  (if (> low high)
      '()
      (cons low 
            (enumerate-interval 
             (+ low 1) 
             high))))
(define (accumulate op initial sequence)
  (if (null? sequence)
      initial
      (op (car sequence)
          (accumulate op 
                      initial 
                      (cdr sequence)))))
(define (unique-pairs n)
  (flatmap (lambda (i)
             (map (lambda (j)
                    (list i j))
                  (enumerate-interval 1 (- i 1))))
           (enumerate-interval 1 n)))
(define (flatmap proc seq)
  (accumulate append '() (map proc seq)))
(define (make-triple-sum n s)
  (filter (lambda (triple)
            (= (+ (car triple) (cadr triple) (caddr triple)) s))
          (flatmap (lambda (x)
                     (map (lambda (xxx) (cons x xxx)) (unique-pairs (- x 1))))
                   (enumerate-interval 1 n))))
#| END |#