How can I prevent the random number generator from creating a race number that was previously given to someone?

I just finished the Race day project —> <— and I couldn’t help to notice there was still an unsolved problem in the project’s hipothetical situation. Two runners can still get the same race number, since it’s a random generator. Is there a way to fix this?

Thank you.

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You can’t.

Remove the picked value from the possible choices, or re-roll on duplicate.