(define (reverse x)
  (define (iter tail result)
    (if (null? tail) result
        (iter (cdr tail)
              (cons (car tail) result))))
  (iter x '()))

; 1 ]=> (map reverse (map iota (iota 5)))
; 
; ;Value: (() (0) (1 0) (2 1 0) (3 2 1 0))