Formation of the 16 personality types

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None of Jung’s eight types occurs in its pure form. The eight types combine with one another in specific ways, resulting in 16 subtypes (rather than 64, as one might assume by multiplying 8 by 8).

A psychological type is a combination of various psychological functions. In his work "Psychological Types", Carl Jung divided all eight function into two groups: RATIONAL (or judging) and IRRATIONAL (or perception).