Yes, I agree that NPA theory is intuitively correct. When we read the descriptions of the NPA types we are struck with the validity.
The ABO blood group personality system in Japan seems good to me, but some consider it like astrology. Since ABO blood group is a gene, it is more interesting to read about the possible correlates. I am B+ and probably N/NA-. One son is AB- and probably NPA-. . The other son is B+ and probably NPA=. They are how I became interested in NPA theory because I never understood them until I read this theory.
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