I prefer the term "alliances", but same basic concept, two large aggregations of teams that play each other fairly often.
Southwest Conference
Texas
OU
Colorado
A&M
Arkansas
Oklahoma State
Arizona
Arizona State
Southern Conference
LSU
MSU
Ole Miss
Bama
Vandy
Auburn
FSU
Missouri
Southeastern Conference
UGA
Tenn
Florida
UK
USCe
NCSU
UNC
UVA
Atlantic Conference
Miami
Clemson
Duke
Wake Forest
Boston College
VT
WVU
Pitt