Finding Intersecting curves

[YJC]

Heya! I’m trying to see if these 4 curves intersect, however the panel shows this, does this mean no curves aren’t intersecting?

trail_2.3dm (2.8 MB) trail_2.gh (12.3 KB)

[inno]

you need to put all the curves to be considered for intersection in the same branch
in your case just flattening the input should do the trick