So the order of questions would be: Liberal, Bloc, NDP, and Conservative for the first round. Questioning during the second round would alternate between opposition members and government members in the following fashion: Liberal, Conservative, Bloc, Conservative, Liberal, Conservative, and Conservative.
That is based on the principle that each committee member should have a full opportunity to question witnesses before anyone gets a chance to repeat their questioning. Everyone would get a chance to speak before anyone spoke twice.