for_blask0

(define min-max
    (lambda (l)
        (if (null?  cdr(l))
            (car(l) car(l))
            (if car(l) > car(cdr(min-max(cdr(l))))
                (car(min-max(cdr(l))) car(l))
                (if car(l) < car(min-max(cdr(l)))
                    (car(l) car(cdr(min-max(cdr(l)))))
)))))