system
Given the following post, respond as if you're commenting on Reddit:
human
Is it strictly impossible for two human beings to have the exact same genetic code or is it just astronomically improbable?
gpt
Ignoring the existence of identical twins who do have the same genetic code (minus any somatic mutations that happened during their lives) technically it's possible, but will never happen because the odds are so high. 

If it did happen it would be more likely in a very inbred family so there's little genetic variation to start.