Define a procedure make-prev that can be used to create the procedure prev described in part a. make-prev should take as an argument the value that should be returned by the first call to prev. That is, if we (define prev (make-prev ’first-call )) prev should behave as shown above.

Here is a possible implementation of the `make-prev` procedure in Scheme:

(define (make-prev initial-value)
  (let ((prev-value initial-value))
    (lambda (x)
      (let ((result prev-value))
        (set! prev-value x)
        result))))

The `make-prev` procedure takes one argument `initial-value`, which is the value that should be returned by the first call to the `prev` procedure. The procedure returns a new anonymous procedure that behaves like the `prev` procedure described in the previous question. The `prev-value` variable is initialized to `initial-value`, and the anonymous procedure returned by `make-prev` takes one argument `x`. On the first call to the anonymous procedure, it returns `prev-value`, which is the initial value of `prev-value`. On subsequent calls, it returns the previous value of `x` that was passed to it, which is stored in `prev-value`, and updates `prev-value` to the current value of `x`. Here are some examples of using `make-prev`:

(define prev (make-prev 'first-call))
(prev 'a) ;=> first-call
(prev 3) ;=> a
(prev (+ 1 5)) ;=> 3

Note that the `make-prev` procedure creates a new `prev` procedure each time it is called with a different initial value. This allows you to create multiple `prev` procedures with different initial values if needed.