The first edition of the 20: 1) the lyrics of Article 5 2) the activity of the 5 3) the time and place of the 5 and 4) the student's understanding of Article 5.
The number of items, including 1 version 20 1) in the lyrics of 5 items 2) the activity leader of 5 items 3) in place of 5 items. 4) and the students" understanding of the 5 items.