Grasshopper/ Surface Edges

Hello, as you see, I have created a Surface and divided it into sub-surfaces. Now my problem is I want to select only the Edge with the color purple and the number 0 see the Figures. I used the command deconstruct BREP to choose only the edges of each surface then I used the command Cull NTH to choose only the Vertical Edges and then didn’t figure out what to do next. anyone has an Idea on maybe how to do it ? or perhaps anyone has a better method ? thank you in advance


you can connect a List Item component to the deconstructed brep edges with index 0