Question: How to implement the following function in Racket: (add e s): return a new set that contains all the elements in s and the element

How to implement the following function in Racket:

(add e s): return a new set that contains all the elements in s and the element e.

For an example:

(define A (set '(1 2 7 9 7 1)))

(add 9 A) = ( 2 9 7 1)

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