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I doubt anybody's done this research, since it would take SO much work and there wouldn't be a whole lot of purpose to it other than satisfying our curiosities.
I've noticed that Kappa and Tri Delta tend to be together quite often, along with Pi Phi and Theta.
I've noticed a KD/DZ/ZTA connection (a school wouldn't have all three, but usually at least two of them), but maybe that's because those are three of the biggest sororities that my school doesn't have.
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