Problem with culling points by multiple z-values

Hi, I would like to cull all points inside “search points” that have not equal z-values, compared to all z values of my search keys.
Unfortunately, I receive a wrong result.

Thanks for your help! (25.4 KB) (25.1 KB)

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Since every branch of points has only one Z coordinate I would select the branches instead of culling. (23.5 KB)

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Thanks a lot for your help!