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(double aside, the underlying typology doesn't have a J at all - the J is mostly meant to indicate what direction the functions point; Ti Ne Fi Se would be a P, while Te Ni Fe Si would be a J; the dominant function points outwards, and thus is 'visible' or 'active.')
(J just means that the primary function you use, is one that is directed towards engagement with the environment. It's not an independent 'thing' in itself. also not to imply that MBTI is like, as valid/predictive as OCEAN or whatever, but it's also wildly misunderstood)
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