How can I define weeks?

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If your school has different timetable on odd and even weeks (sometimes called weekA and weekB), you can simply define that you have two or more weeks:

Then for each lesson, you can say in which week it can be. Default is All weeks. This means it will be at the same position in all weeks. If you change this to lets say Any week, the software will allow you to place this lesson into week 1 OR 2.