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In this paper, we introduce a simple method for sketching 3D models in arbitrary topology. Using this method, we have developed a system to convert silhouette sketches to 3D meshes that mostly consists of quadrilaterals and 4-valent vertices. Because of their regular structures, these 3D meshes can effectively be smoothed using Catmull-Clark subdivision. Our method is based on the identification of corresponding points on a set of input curves. Using the structure of correspondences on the curves, we partition curves into junction, cap and tubular regions and construct mostly quadrilateral meshes using this partitioning.