There's a Jungian trope about threes (and, of course, cross gender figures as anima/animus): He posits a progress of integrating his four functions in which there first three can be disentangled with the integration of excluded elements of individual biography. But the fourth is embedded in the collective unconscious where the fracture lines aren't basically solvable through some sort of personal 'heroics', eg solve death will ya. So the whole dynamic changes as you move from 3 to 4.
There's a Jungian trope about threes (and, of course, cross gender figures as anima/animus): He posits a progress of integrating his four functions in which there first three can be disentangled with the integration of excluded elements of individual biography. But the fourth is embedded in the collective unconscious where the fracture lines aren't basically solvable through some sort of personal 'heroics', eg solve death will ya. So the whole dynamic changes as you move from 3 to 4.