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Complicated temporal expressions like this need to be built from the inside out. So, to start off you will create the Monday through Wednesday intersection, the Saturday intersection, the Sunday intersection, and the Saint Patrick's Day intersection. Finally, you will assemble the intersections into the Union, Substitution, and Difference collections.

In the Find Temporal Expression screen, click Create. In the Temporal Expression Maintenance screen, find the Day Of Week Range section. Type MON_THRU_WED in the Expression ID field. Select Monday for the From field and select Wednesday for the To field. Click the Save button. Go back to the Find Temporal Expression screen, and click Create. In the Temporal Expression Maintenance screen, find the Intersection section. Type MON_THRU_WED_6PM in the Expression ID field and click the Save button. Now you can add member expressions to the intersection. Select MINUTE_00 in the Include field and click Save. Select HOUR_18 in the Include field and click Save. Select MON_THRU_WED in the Include field and click Save. Your Monday through Wednesday at 6PM intersection is finished.