How to stop a course reoccurring every once in 3 years

Summary:

I have course 1 and course 2 in a specialization and this specialization is reoccurring every 3 years. and course 1 has to be reoccur every every but on every 3rd year this course should not be assigned to learner as this is assigned as part of specialization

Similarly if a specialization has 5 courses and each course has different assignment date and how to make sure the courses from specialization shouldnt assign on same year/month as per requirement

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25C

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