Twelve new canidates were randomly generated and the process starts again. However, even those the previous candidate is show (here in red), it won't be mutated or chosen for crossover. It isn't part of the new set of twelve candidates. Instead, it will be saves as a terminal leaf in the syntax tree and will be used for calculating the new fitness fuctions. That is, the next "best" candidate will fit the remaining data that the red winning candidate doesn't encapsulate.
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