split list by uv direction

Hi,

I´m quite new to Grasshopper - so I might have just not found the right path.

So what I was trying to do is that I have a mesh from which I got the interior edges.

The problem now is that there is such a huge count of lines and I want to reduce them and go on with the half or a third of them in u and v direction.

I try to do this by the component "split list" but i don´t know how to set the splitting index to get two separate lists with the lines in u direction and the other one with the v direction.

Any advices? 

Attached are screenshots of the form.

Thanks, 

David