sort list elements - part 2

Thanks to Alex I named properly my items. Now, to complete this list, I have to add other information. Here attached the sample:

I have line connected to points. Each line touches some point. I have a list of point in which you see which line is touching.

The goal is to see a list where is written:

"Node name"-"Bore name"_"Line name"_"Node name"-"Bore name", as start and end connection.

Everything was almost ok, but there is a step where I have the correct list as

0;0

1;0

2;0

2;1

etc

and they were converted in the new list as

0;0

0;1

0;2

0;3

etc.

how can I keep the original branch name and order?

sorry in advance because of my redundant def, but I'm an entry level user...

thanks

The entire def:

The cluster with the problem:

The entire cluster and the problem in red: