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Curve Curve From Objects > Intersect Self 
The IntersectSelf command finds selfintersections in curves and marks them with point objects. Intersections between curves are ignored.
Create point objects or curves at the intersections of curves and surfaces.
Find the intersection of one set of objects with another set of objects.
Create a polyline at the intersection of mesh objects.
Creates polylines from selfintersections of mesh objects.
Rhinoceros 7 © 20102021 Robert McNeel & Associates. 20Oct2021