My study design contains three conditions (A, B, and C) after which they are asked the same questions. These conditions are modeled as question groups. To avoid unwanted order effects, a latin square is used to calculate all possible combinations of A, B, and C. Since I know the Order in which a participant will go through the conditions I want to be able to specify the according group order at the whenever a launch a new instance of that survey, either by a field or by a URL parameter.