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    CGAL 4.7 - 2D Polyline Simplification 
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CGAL::Polyline_simplification_2::Hybrid_squared_distance_cost 
CGAL::Polyline_simplification_2::Scaled_squared_distance_cost 
CGAL::Polyline_simplification_2::Stop_below_count_ratio_threshold 
CGAL::Polyline_simplification_2::Vertex_base_2<Vb>