Grasshopper contour line sort

hi, I want to group the contour lines on the z axis

Since the flip matrix does not work I think that the current data seems to be branch set with each column first

How do I change the branch path to a height value?
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If you link your old thread. Maybe ask there again and don’t create a new thread for everything…

First of all, should search the error for this:

To your question: you really should have look into data management:

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