relevant social groupings (not tiers)

The frats and sororities in each group social with each other regularly
Really hard to argue with this, rushes should refer here

1. DChi, Beta Sig, Sig Chi, Pike, DSig, Sammy -- APhi, KD, KKG, Pi Phi, Theta
2. Acacia, Lambda, ATO, Sig Ep, TKE, AEPI, Sig Pi -- GPhi, (ESA), AXiD, Zeta, [AXO], [ASA]
3. Phi Psi, AGR, TDX, DU, Phi Who -- DZ, DG, AOPi, SDT