You can create special card relationship that defines how many lessons shall be before certain position.
For example this picture defines a cardrelationship for all classes that have 1,2,3 or 4 biology lessons. For these classes the generator shall always place at least 2 lessons before 4th period:
So now there are at least 2 lessons of biology on good positions.
For classes that have more Biology lessons per week you can specify another card relationships.
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