I have a little concern about the following item classes: Bow and Arrow, and Letter or Potion.

When I check their descriptions, all I see is the undefined item class descriptions for the unused zz item classes, even though these two classes are technically not undefined as they each have one purpose. The Bow and Arrow class basically display the bow and the arrow in the subscreen, and the Letter or Potion class basically displays a letter or a potion in the subscreen. So in other words, I think the descriptions for these two item classes need to be changed.

For the Bow and Arrow Class:
This class should only be used to display the bow and the arrow in the subscreen.

And for the Letter or Potion Class:
This class should only be used to display a letter or a potion in the subscreen.