It seems that tools used in this paper supplement each other. This is because each tool had the characteristics and was taken advantages in each single distance learning lesson.
Particularly, in the case stated in 3.3, participants could communicate in different way: communication with every part of and a part of the body.Although such a different way of communication could have different meanings, it seems to supplement each other.
This supplement could be a significant point in planning distance learning lesson and deciding which tool is used in distance learning.