Use path mapper or any function for specific data grouping

I have some data problems would like to ask about… I guess it should be done through path mapper but not quite sure how to manipulate two together?

I would like to organize two splitted groups of data and make them organized as 3 items in one branch.
Assume ① is from one group and ② is from another group. x and y means index for each…
hope these 3 items could be in one branch: ①: {x}(y),②:{x-1}(y), ②:{x-1}(y+1) (Aiming to connect these three points)

is that even possible? Thank you for click the question and any help!
Data (18.8 KB)

Is that right?