English: A 3D image that shows the intersection of 2 surfaces. Surfaces 1 is blue and the normal vectors are oriented upwards. Surface 2 is red and the normal vectors are oriented to the right. The intersection is the black curve. The orientation of the intersection curve is determined via the right-hand rule with the surface normals of surface 1 as the "x" direction, and the surface normals of surface 2 as the "y" direction.
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