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One way to simplify a nested list into a single list in Racket is to use the flatten function.
The flatten function takes a nested list and returns a single list by recursively flattening any nested sublists. Here's an example:
> (define nested-list '((1 2) (3 (4 5)) 6))
> (flatten nested-list)
'(1 2 3 4 5 6)
In this example, the nested-list variable contains a nested list with three elements: (1 2), (3 (4 5)), and 6. The flatten function is then applied to this nested list to produce a single list containing all the elements. The resulting list is (1 2 3 4 5 6).