c1 = NurbsCurve.ByPoints(Autodesk.Point.ByCoordinates
([0,0.1,0.5,0.9,1],[0.1,0.125,0.5,0.74,0.75]));
c2 = Arc.ByCenterPointStartPointEndPoint(Autodesk.Point.ByCoordinates(1,0),
Autodesk.Point.ByCoordinates(1,0,-0.75),Autodesk.Point.ByCoordinates(1,0.75));
c3 = Arc.ByCenterPointStartPointEndPoint(Autodesk.Point.ByCoordinates(0,0.75),
Autodesk.Point.ByCoordinates(0,0.1),Autodesk.Point.ByCoordinates(0,0.75,-0.75));