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All other constraints are referred to as soft constraints. Since there are shortages of human resources, quota requirements have to be reached rather than fulfilled, and particular attention is paid to Mondays and Fridays shifts.Nurses often call off on those days and the clerk tries to have the exact quota needed for those specific two days (to avoid subsequent absenteeism due to expected increasing workload). Week-ends assignments in these examples are fixed and cannot be modified.
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