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There are many paradigms for classifying personality types. Some say there are 4 personality types. Others 8.. 12.. 16. One of the most well-known is <a href="https://en.wikipedia.org/wiki/Myers%E2%80%93Briggs_Type_Indicator" target="_blank">Myers-Briggs</a>, which breaks down our personalities into a series of cognitive functions where some are dominant over others.