package org.unitime.timetable.events;
import java.util.ArrayList;
import java.util.Calendar;
<BUG>import java.util.Collection;
import java.util.HashMap;</BUG>
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Iterator;

package org.unitime.timetable.events;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Iterator;
