Merging a List of lists

I’m trying to merge this list into one full list so i can extract individual lines. Everything I’ve tried isn’t working. Attached is a picture of what I’ve tried. The major issue seams to be as if it only allows me to use a function to manipulate each of the individual sub lists within the list and not merge them together. Maybe I am using the wrong function? I don’t know!

attached is also files that express a simplified setup of what I’m attempting to do.

Playing_With_Lists.3dm (28.5 KB) (9.5 KB)

Could you help with this one too?
Its off of what you have already helped me with.

It’s a good idea to learn the basics about Grasshopper before you ask every details to this discourse. You’ll find many tutorials from old GH forum. (10.8 KB)

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