Optimizing the room usage for students
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At least one lesson per week has to be in certain classroom
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We have 3 lessons per week and they shall be in the same classroom
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Lesson can be only once per week in certain classroom
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Reducing the room usage
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GymRoom can only be used 4 days per week(GymRoom has to be free on 3 afternoons)
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Concentrate groups of lessons into fewer classrooms
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