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Hi! My final objective is to select only magenta lines (see the picture).

I have plan to build area from white and red lines and then, using line on area, select only magenta lines. Main problem of my idea is that i am unable to build area as i planed because white line is only touching red line (red line is not broken on intersection - i suppose this is why area builder is unable to form area). Any idea how to form area from white and red lines? Or suggestion how to select magenta lines on some different way? Thanks in advance.

You can use an Intersector on the red and white lines and then an AreaBuilder to create areas out of that.

Then to select the magenta lines a Clipper or LineOnAreaOverlayer plus Tester.

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