For example you have one doulbe lesson of Algebra on week A and one double lesson of Geometry in week B. The software may put them on different days, which is usually not a bad thing.
However if you want them to be on the same time in each week, because teachers might swap kids, you can create this cardrelationship:
Basivally this will say there can be max 2 periods per all weeks. If the lessons are not at the same time, they will need more periods, thus the generator has to put them together.
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