[racket] HtDP: Why is quick-sort considered generative recursion?

>>Notice that the quicksort
>>function makes calls to
>>itself passing in arguments that are not
>>sub-components of the original input.

Hm...It's true that the main function doesn't conform to the usual recipe, but the auxiliaries do, right? I understand the rolling-ball and gcd examples, but this one still eludes me....
 		 	   		  
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