[racket] Replacing lambdas with defines

Below, I have enclosed the code from Rosetta for generating Permutations.
Can someone show me how to replace nested lambdas with defines?
Thanks,

(define (insert l n e)

  (if (= 0 n)

      (cons e l)

      (cons (car l)

            (insert (cdr l) (- n 1) e))))


(define (seq start end)

  (if (= start end)

      (list end)

      (cons start (seq (+ start 1) end))))


(define (permute l)

  (if (null? l)

      '(())

      (apply append (map (lambda (p)

                           (map (lambda (n)

                                  (insert p n (car l)))

                                (seq 0 (length p))))

                         (permute (cdr l))))))
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