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It seems to me that all we can observe about the cincept of self outside of what we presume to be the norm undermibes any simplistic model based on individual experience https://thewalrus.ca/how-conjoined-twins-are-making-scientists-question-the-concept-of-self/
I have read about these twins before, I think they are the only such case of survival past a few days, others are either stillborn, or die shortly after birth because of severe brain abnormalities.