Select pairs of items from the same tree using an offset pattern.

Input parameters:

1. Tr → Tree to pick from.
2. Of → Offset pattern for path elements and item indices.
3. Wp → Wrap offset path elements when they exceed path limits.
4. Wi → Wrap offset item indices when they exceed list limits.
5. Sk → Skip pairs with only a single defined element.
   •  True → Skip
   • False → Include

Output parameters:

1. A → First item in each pair.
2. B → Second item in each pair.