I have a table with 26 yes/no fields for periods of equipment maintenance. The user will be able to check multiple periods. What the user wants is a list of all periods that maintenance is do. For example a piece of equipment is marked for maintenance due in periods 4, 8,12, 16, 20, and 24. The report should show 4, 8,12, 16, 20, 24. What is the best approach to this result?