How to cull point list like this?

[Rezome]

This is my surface and points and I want to select points like this.

And the list looks like this, 2d list.

[Rezome]

The reason I’m doing this is because I can’t have a uv line with two different surface pieces connected. If I know how to solve this, I actually don’t need a way above.

[Ryan14 (Ryan)]

Good evening @Rezome
It would be very helpful to have a gh file to work on.

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[Rezome]

same_uv_surface.3dm (3.8 MB)
same_uv_surface.gh (15.6 KB)

Thank you for your tip. Here’s my file.
I am a newbie for grasshopper, so please forgive my weird script.

[Ryan14 (Ryan)]

No worries. Will try tonight.

[Rezome]

Thank you so much @Ryan14 !

[Rezome]

I think I make it!. I changed the data structure and used the cull. Thank you so much for your care. Also, I succeeded in drawing continuous v curves of two different connected surface using the closed point component. But I am now studying the way to extract u and v points using this method. Maybe I can just intersect existing u curve with continuous v curve.

Thank you.