Sort curves along curve

[Dmitry_Korchemny]

Hi everybody!
I want to create ground surface, so I need to sort curves along curve. I sorted middle points along curve, but some points didnt sort and i lofted wrong surface. What is my mistake?

ERROR 23-03-31.gh (16.1 KB)

[HS_Kim]

You’ll have to deal with duplicate lines and also you should provide a proper guide curve for Sort Along Curve.

ERROR 23-03-31_re.gh (17.8 KB)