As a general point, consistency and symmetry are important. I hate the way Keirsey made the Temperaments based on different variables...
Any one of the possible permutations is better than Keirsey's system if you remain consistent. I have put a great deal of analysis into all of them, and they all have interesting, unique qualities. They could all be useful. I do try to avoid overlap, though. Hence -xx- and x--x. It would seem silly to me to combine -xx- with -x-x, as it is redundant on one, and leaves another out.
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