The constraints you define here will be used by the scheduling algorithm to generate optimal exam timetables:

• Teacher Constraints: The algorithm will avoid scheduling exams during times when teachers are unavailable.
• Holiday Constraints: No exams will be scheduled on dates marked as holidays.

These constraints are treated as hard constraints, meaning they must be satisfied for a schedule to be considered valid. The more constraints you add, the more challenging it becomes to find an optimal schedule, but the resulting schedule will better respect everyone's availability.