If you have nearly finished your timetable, but there are still some cards that are not placed in timetable and you want to remove all those cards from timetable, you can do it this way:
Go to menu - Options - Advanced. Type following in Advanced field:
Then click OK. Program will change definitions of lessons for classes and teachers in a way that there will be no unplaced cards, but placed cards will stay in the timetable.
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