I think the most important variable is --XX. FJs, TJs, FPs, and TPs are pretty obviously distinct groups to me. J/P tells the attitude of the person, and T/F tells the focus of that attitude.
I think most groupings can be useful, though. I think -XX- would be the next most important, closely followed by X--X. I don't find XX-- and X-X- very useful, although I find X-X- to be the easiest to type, generally.
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