what sororities are at brown university?
['Alpha Chi Omega - ΑΧΩ Ratings: 53. Grade: 77.55%', 'Delta Gamma - ΔΓ Ratings: 6. Grade: 84%', 'Kappa Alpha Theta - ΚΑΘ Ratings: 61. Grade: 83.02%', 'Kappa Delta - ΚΔ Ratings: 73. Grade: 77.03%']