https://en.wikipedia.org/wiki/Chang_and_Eng_Bunker
https://abcnews.go.com/International/saudi-surgeon-completes-48th-procedure-separate-conjoined-twins/story?id=67238544
It would appear that there is a higher prevalence in N cultures. A patient who had conjoined twins is very much N type. Or perhaps NP? This is an example of Darwinian random production of variation and selection by the environment. An authoritarian or militant cultures may not be as prone to production of random variation, but some of their surgeons perform operations to separate conjoined twins.
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