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Curve Curve From Objects > Intersection 
The Intersect command creates point objects or curves at the intersection of at least two curves and surfaces.
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Curve From Objects > Intersection of Two Sets 
The IntersectTwoSets command finds the intersection of one set of objects with another set of objects.
Intersections among objects within each set are ignored.
Create curves from other objects
Rhino for Mac © 20102017 Robert McNeel & Associates. 24Oct2017