I think this is how the rotation worked versus Nebraska.
Minnesota's normal serving rotation is SSS, Barnes (who subs in for Hart), CC (taking Morgan's spot in the rotation), Samedy, Rollins, and then Pittman.
The starters versus Nebraska were with SSS serving: SSS, CC, Rollins in the back row and Hart, Morgan, Samedy in the the front.
The next rotation: Back Row: Barnes (replacing Hart), SSS, CC. Front: Morgan, Samedy, Rollins.
Next: Back: CC (taking Morgan's spot), Barnes, SSS. Front: Samedy, Rollins, Pittman (taking CC's spot).
Next: Back: Samedy, CC, Barnes. Front: Rollins, Pittman, SSS.
Next, Back: Rollins, Samedy, CC. Front: Pittman, SSS, Hart (replacing Barnes).
Next: Back: Pittman, Rollins, Samedy. Front: SSS, Hart, Morgan (replacing CC).