how to get rid of 2 of the same lines and points in lists?

Hey guys

Newbie here:

Doing a project on a gridshell, for my bachelor.

I have a problem getting rid of the lines and points that occur more than once in my definitions.

I have created a triangular grid on a surface, only to find that the lines occur twice or more, i understand why they do it, I just dont know how to solve the issue.
maybe there is a better way of doing the definition? so i have tried to do variations.

I want to extract the lines and the points to excel, only there can not be more than 1 line occuring between the same two points.

been trying to do this sorting and deletion for days now without luck.

thanks in advance

-Rasmus

NB: Enclosed is my definition, I'm also working on numbering the elements but would like to try doing that myself.