ranks by mixing schedules

Saw this idea in another post, this one is more updated though:

Core four:
AD, DU, Sig Chi, Sig Phi

Core four and mid:
Phi Psi, Sig Pi

Core four (less frequently) and mid:
Chi Phi, Chi Psi (only multiways), DX, Sig Nu

Mid:
Fiji, Lambda, ZBT (although probably not anymore)

Mid and lower:
Llenroc, Pike, Pi Kapp, Phi Sig, Phi Tau, Sammy

Lower:
AEPi, AGR, Kappa Sig, Phi Delt, Sig Ep, Zeta Psi