Question: [RACKET] (by modify the professor means just use this program) 3. Modify the program as follows: (define (mystery L) (if (null? L) (begin (displayln L)

[RACKET] (by modify the professor means just use this program)

[RACKET] (by modify the professor means just use this program) 3. Modify

3. Modify the program as follows: (define (mystery L) (if (null? L) (begin (displayln L) (append (mystery (cdr L)) (list (car L)))))) What does begin do? What does displayin do

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