I thought I had it figured out too, but it turns out that siouxfan123 is correct. From a home-and-home every season standpoint, it's clearly:
UND-SCSU
UMTC-UW
DU-CC
MTU-UMD
UAA-MSUM
What I didn't know is that not every team in the WCHA follow's UND's pattern (six from every pair each season plus home-and-home). For example, UAA has the following pattern:
Home-and-home - MSUM every season
Six games - UND/SCSU pair every season
Six games - UMTC/UW pair every season
Here's the funky part:
Eight games and four games with the DU/CC pair every other season
Eight games and four games with the MTU/UMD pair every other season.