diff --git a/Circular_kernel_2/examples/Circular_kernel_2/CMakeLists.txt b/Circular_kernel_2/examples/Circular_kernel_2/CMakeLists.txt
index e3dbaa4fcef..fbb4186592c 100644
--- a/Circular_kernel_2/examples/Circular_kernel_2/CMakeLists.txt
+++ b/Circular_kernel_2/examples/Circular_kernel_2/CMakeLists.txt
@@ -12,12 +12,6 @@ if ( CGAL_FOUND )
   include(${CGAL_USE_FILE})
   include(CreateSingleSourceCGALProgram)
 
-  create_single_source_cgal_program( arrangement_random_circles.cpp )
-  create_single_source_cgal_program( arrangement_random_circles_segments.cpp )
-  create_single_source_cgal_program( Circular_kernel_arrangement.cpp )
-  create_single_source_cgal_program( Circular_kernel_arrangement_Line_arc.cpp )
-  create_single_source_cgal_program( Circular_kernel_arrangement_Line_Circular.cpp )
   create_single_source_cgal_program( intersecting_arcs.cpp )
-  create_single_source_cgal_program( Exact_circular_kernel.cpp )
 
 endif()
diff --git a/Circular_kernel_2/examples/Circular_kernel_2/Circular_kernel_arrangement.cpp b/Circular_kernel_2/examples/Circular_kernel_2/Circular_kernel_arrangement.cpp
deleted file mode 100644
index 4550059ab21..00000000000
--- a/Circular_kernel_2/examples/Circular_kernel_2/Circular_kernel_arrangement.cpp
+++ /dev/null
@@ -1,55 +0,0 @@
-#include <CGAL/Cartesian.h>
-#include <CGAL/point_generators_2.h>
-#include <CGAL/MP_Float.h>
-#include <CGAL/Gmpq.h>
-#include <CGAL/Algebraic_kernel_for_circles_2_2.h>
-#include <CGAL/intersections.h>
-#include <CGAL/Circular_kernel_2.h>
-#include <CGAL/Arr_circular_arc_traits.h>
-#include <CGAL/Arrangement_2.h>
-#include <CGAL/Arr_naive_point_location.h>
-#include <CGAL/Random.h>
-
-
-typedef CGAL::Quotient<CGAL::MP_Float>                  NT;
-typedef CGAL::Cartesian<NT>                             Linear_k;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT>      Algebraic_k;
-typedef CGAL::Circular_kernel_2<Linear_k,Algebraic_k>   Circular_k;
-
-typedef Circular_k::Circular_arc_2                      Arc_2;
-typedef std::vector<Arc_2>                              ArcContainer;
-
-typedef CGAL::Arr_circular_arc_traits<Circular_k>       Traits;
-
-typedef CGAL::Arrangement_2<Traits>                     Arrangement;
-typedef CGAL::Arr_naive_point_location<Arrangement>     Point_location;
-
-typedef Circular_k::Point_2                             Point_2;
-typedef Circular_k::Circle_2                            Circle_2;
-int main(){
-
-  CGAL::Random generatorOfgenerator;
-  int random_seed = generatorOfgenerator.get_int(0, 123456);
-  std::cout << "random_seed = " << random_seed << std::endl;
-  CGAL::Random theRandom(random_seed);
-  int random_max = 128;
-  int random_min = -128;
-  ArcContainer ac;
-  int x;
-  int y;
-  for(int i = 0; i < 10; i++){
-    x = theRandom.get_int(random_min,random_max);
-    y = theRandom.get_int(random_min,random_max);
-    ac.push_back( Circle_2( Point_2(x,y), x*x + y*y));
-  }
-
-  Arrangement arr;
-  Point_location _pl(arr);
-  for (ArcContainer::const_iterator it=ac.begin();
-       it != ac.end(); ++it) {
-    //insert(arr,_pl, *it);
-    insert_curve(arr, *it, _pl);
-      };
-
-  return 0;
-};
diff --git a/Circular_kernel_2/examples/Circular_kernel_2/Circular_kernel_arrangement_Line_Circular.cpp b/Circular_kernel_2/examples/Circular_kernel_2/Circular_kernel_arrangement_Line_Circular.cpp
deleted file mode 100644
index 69a1144c61c..00000000000
--- a/Circular_kernel_2/examples/Circular_kernel_2/Circular_kernel_arrangement_Line_Circular.cpp
+++ /dev/null
@@ -1,84 +0,0 @@
-#include <CGAL/Cartesian.h>
-#include <CGAL/point_generators_2.h>
-#include <CGAL/MP_Float.h>
-#include <CGAL/Algebraic_kernel_for_circles_2_2.h>
-#include <CGAL/intersections.h>
-#include <CGAL/Circular_kernel_2.h>
-#include <CGAL/Arr_circular_line_arc_traits.h>
-#include <CGAL/Arrangement_2.h>
-#include <CGAL/Arr_naive_point_location.h>
-#include <boost/variant.hpp>
-
-#include <CGAL/Random.h>
-
-
-typedef CGAL::Quotient<CGAL::MP_Float>                      NT;
-typedef CGAL::Cartesian<NT>                                 Linear_k;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT>          Algebraic_k;
-typedef CGAL::Circular_kernel_2<Linear_k,Algebraic_k>       Circular_k;
-
-typedef Circular_k::Point_2                                 Point_2;
-typedef Circular_k::Circle_2                                Circle_2;
-typedef Circular_k::Circular_arc_2                          Circular_arc_2;
-typedef Circular_k::Line_arc_2                              Line_arc_2;
-
-typedef boost::variant< Circular_arc_2, Line_arc_2>         Arc_2;
-typedef std::vector< Arc_2>                                 ArcContainer;
-
-typedef CGAL::Arr_circular_line_arc_traits<Circular_k,
-					   Circular_arc_2, Line_arc_2>  Traits;
-
-typedef CGAL::Arrangement_2<Traits>                         Arrangement;
-typedef CGAL::Arr_naive_point_location<Arrangement>         Point_location;
-
-
-int main(){
-
-  CGAL::Random generatorOfgenerator;
-  int random_seed = generatorOfgenerator.get_int(0, 123456);
-  std::cout << "random_seed = " << random_seed << std::endl;
-  CGAL::Random theRandom(random_seed);
-  int random_max = 128;
-  int random_min = -128;
-  ArcContainer ac;
-  int x1;
-  int y1;
-  int x2;
-  int y2;
-
-  for(int i = 0; i < 10; i++){
-    x1 = theRandom.get_int(random_min,random_max);
-    y1 = theRandom.get_int(random_min,random_max);
-    do{
-      x2 = theRandom.get_int(random_min,random_max);
-      y2 = theRandom.get_int(random_min,random_max);
-    }while((x1 == x2) && (y1 == y2));
-
-    std::cout << x1 << " "
-  	      << y1 << " "
-  	      << x2 << " "
-  	      << y2 << std::endl;
-    boost::variant< Circular_arc_2, Line_arc_2 > v =  Line_arc_2(Point_2(x1,y1), Point_2(x2,y2));
-    ac.push_back( v);
-  }
-
-   for(int i = 0; i < 10; i++){
-    x1 = theRandom.get_int(random_min,random_max);
-    y1 = theRandom.get_int(random_min,random_max);
-    boost::variant< Circular_arc_2, Line_arc_2 > v = Circle_2( Point_2(x1,y1), x1*x1 + y1*y1);
-    ac.push_back(v);
-  }
-
-
-
-
-  Arrangement arr;
-  Point_location _pl(arr);
-  for (ArcContainer::const_iterator it=ac.begin();
-       it != ac.end(); ++it) {
-    //insert(arr,_pl,*it);
-    insert_curve(arr, *it, _pl);
-      };
-
-  return 0;
-};
diff --git a/Circular_kernel_2/examples/Circular_kernel_2/Circular_kernel_arrangement_Line_arc.cpp b/Circular_kernel_2/examples/Circular_kernel_2/Circular_kernel_arrangement_Line_arc.cpp
deleted file mode 100644
index a0bb27c840b..00000000000
--- a/Circular_kernel_2/examples/Circular_kernel_2/Circular_kernel_arrangement_Line_arc.cpp
+++ /dev/null
@@ -1,78 +0,0 @@
-#include <CGAL/Cartesian.h>
-#include <CGAL/point_generators_2.h>
-#include <CGAL/MP_Float.h>
-#include <CGAL/Gmpq.h>
-#include <CGAL/Algebraic_kernel_for_circles_2_2.h>
-#include <CGAL/intersections.h>
-#include <CGAL/Circular_kernel_2.h>
-#include <CGAL/Arr_line_arc_traits.h>
-#include <CGAL/Arrangement_2.h>
-#include <CGAL/Arr_naive_point_location.h>
-#include <CGAL/Random.h>
-
-typedef CGAL::Quotient<CGAL::MP_Float>                      NT;
-typedef CGAL::Cartesian<NT>                                 Linear_k;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT>          Algebraic_k;
-typedef CGAL::Circular_kernel_2<Linear_k,Algebraic_k>       Circular_k;
-
-//typedef Circular_k::Circular_arc_2                        Arc;
-typedef Circular_k::Line_arc_2                              Arc_2;
-typedef std::vector<Arc_2>                                  ArcContainer;
-
-typedef CGAL::Arr_line_arc_traits<Circular_k>               Traits;
-
-typedef CGAL::Arrangement_2<Traits>                         Arrangement;
-typedef CGAL::Arr_naive_point_location<Arrangement>         Point_location;
-
-typedef Circular_k::Point_2                           Point_2;
-typedef Circular_k::Line_arc_2                        Line_arc_2;
-int main(){
-
-  CGAL::Random generatorOfgenerator;
-  int random_seed = generatorOfgenerator.get_int(0, 123456);
-  //std::cout << "random_seed = " << random_seed << std::endl;
-  CGAL::Random theRandom(random_seed);
-  int random_max = 5;
-  int random_min = -5;
-  for(int j = 0; j < 10 ; j++){
-
-  ArcContainer ac;
-  int x1;
-  int y1;
-  int x2;
-  int y2;
-
-    for(int i = 0; i < 50; i++){
-      x1 = theRandom.get_int(random_min,random_max);
-      y1 = theRandom.get_int(random_min,random_max);
-      do{
-   	x2 = theRandom.get_int(random_min,random_max);
-   	y2 = theRandom.get_int(random_min,random_max);
-      }while((x1 == x2) && (y1 == y2));
-
-
-      std::cout << x1 << " "
-   		<< y1 << " "
-   		<< x2 << " "
-   		<< y2 << std::endl;
-      ac.push_back( Line_arc_2(Point_2(x1,y1), Point_2(x2,y2)));
-    }
-
-  //while(std::cin >> x1 >> y1 >> x2 >> y2){
-   // ac.push_back( Line_arc_2(Point_2(x1,y1), Point_2(x2,y2)));
-  //}
-
-    {
-      int i = 0;
-      Arrangement arr;
-      Point_location _pl(arr);
-      for (ArcContainer::const_iterator it=ac.begin();
-	   it != ac.end(); ++it) {
-	std::cout << i++ << std::endl;
-	//insert(arr,_pl,*it);
-	insert_curve(arr, *it,_pl);
-      }
-    }
-  }
-  return 0;
-};
diff --git a/Circular_kernel_2/examples/Circular_kernel_2/Exact_circular_kernel.cpp b/Circular_kernel_2/examples/Circular_kernel_2/Exact_circular_kernel.cpp
deleted file mode 100644
index 4ba891ef46f..00000000000
--- a/Circular_kernel_2/examples/Circular_kernel_2/Exact_circular_kernel.cpp
+++ /dev/null
@@ -1,66 +0,0 @@
-#include <CGAL/basic.h>
-#include <CGAL/Random.h>
-#include <CGAL/point_generators_2.h>
-#include <CGAL/Exact_circular_kernel_2.h>
-#include <CGAL/Arr_circular_line_arc_traits.h>
-#include <CGAL/Arrangement_2.h>
-#include <CGAL/Arr_naive_point_location.h>
-
-typedef CGAL::Exact_circular_kernel_2                   Circular_k;
-
-typedef Circular_k::Point_2                             Point_2;
-typedef Circular_k::Circle_2                            Circle_2;
-typedef Circular_k::Circular_arc_2                      Circular_arc_2;
-typedef Circular_k::Line_arc_2                          Line_arc_2;
-
-typedef boost::variant< Circular_arc_2, Line_arc_2>     Arc_2;
-typedef std::vector< Arc_2> ArcContainer;
-
-typedef CGAL::Arr_circular_line_arc_traits
-              <Circular_k, Circular_arc_2, Line_arc_2>  Traits;
-
-typedef CGAL::Arrangement_2<Traits>                            Arr;
-typedef CGAL::Arr_naive_point_location<Arr>                 Point_location;
-
-int main(){
-
-  CGAL::Random generatorOfgenerator;
-  int random_seed = generatorOfgenerator.get_int(0, 123456);
-  std::cout << "random_seed = " << random_seed << std::endl;
-  CGAL::Random theRandom(random_seed);
-  int random_max = 128;
-  int random_min = -128;
-  ArcContainer ac;
-  int x1, y1, x2, y2;
-
-  for (int i = 0; i < 10; i++) {
-    x1 = theRandom.get_int(random_min,random_max);
-    y1 = theRandom.get_int(random_min,random_max);
-    do{
-      x2 = theRandom.get_int(random_min,random_max);
-      y2 = theRandom.get_int(random_min,random_max);
-    } while((x1 == x2) && (y1 == y2));
-    std::cout << x1 << " " << y1 << " " << x2 << " " << y2 << std::endl;
-
-    boost::variant< Circular_arc_2, Line_arc_2 >
-      v =  Line_arc_2(Point_2(x1,y1), Point_2(x2,y2));
-    ac.push_back( v);
-  }
-
-   for (int i = 0; i < 10; i++) {
-    x1 = theRandom.get_int(random_min,random_max);
-    y1 = theRandom.get_int(random_min,random_max);
-
-    boost::variant< Circular_arc_2, Line_arc_2 >
-      v = Circle_2( Point_2(x1,y1), x1*x1 + y1*y1);
-    ac.push_back(v);
-   }
-
-  Arr _pm;
-  Point_location _pl(_pm);
-  for (ArcContainer::const_iterator it=ac.begin(); it != ac.end(); ++it) {
-    insert_curve(_pm,*it,_pl);
-  };
-
-  return 0;
-};
diff --git a/Circular_kernel_2/examples/Circular_kernel_2/GNUmakefile b/Circular_kernel_2/examples/Circular_kernel_2/GNUmakefile
index 0b28a203f1e..240fae4c623 100644
--- a/Circular_kernel_2/examples/Circular_kernel_2/GNUmakefile
+++ b/Circular_kernel_2/examples/Circular_kernel_2/GNUmakefile
@@ -37,58 +37,13 @@ LDFLAGS = \
 #---------------------------------------------------------------------#
 
 all:            \
-	arrangement_random_circles$(EXE_EXT) \
-	arrangement_random_circles_segments$(EXE_EXT) \
-	Exact_circular_kernel$(EXE_EXT) \
-        Circular_kernel_arrangement$(EXE_EXT) \
-        Circular_kernel_arrangement_Line_arc$(EXE_EXT) \
-        Circular_kernel_arrangement_Line_Circular$(EXE_EXT) \
-        intersecting_arcs$(EXE_EXT) \
-        Lazy_Circular_kernel_arrangement$(EXE_EXT) \
-        Lazy_Circular_kernel_arrangement_Line_arc$(EXE_EXT) \
-        Lazy_Circular_kernel_arrangement_Line_Circular$(EXE_EXT) 
-
-arrangement_random_circles$(EXE_EXT): arrangement_random_circles$(OBJ_EXT)
-	$(CGAL_CXX) $(LIBPATH) $(EXE_OPT)arrangement_random_circles arrangement_random_circles$(OBJ_EXT) $(LDFLAGS)
-
-arrangement_random_circles_segments$(EXE_EXT): arrangement_random_circles_segments$(OBJ_EXT)
-	$(CGAL_CXX) $(LIBPATH) $(EXE_OPT)arrangement_random_circles_segments arrangement_random_circles_segments$(OBJ_EXT) $(LDFLAGS)
-
-Exact_circular_kernel$(EXE_EXT): Exact_circular_kernel$(OBJ_EXT)
-	$(CGAL_CXX) $(LIBPATH) $(EXE_OPT)Exact_circular_kernel Exact_circular_kernel$(OBJ_EXT) $(LDFLAGS)
-
-Circular_kernel_arrangement$(EXE_EXT): Circular_kernel_arrangement$(OBJ_EXT)
-	$(CGAL_CXX) $(LIBPATH) $(EXE_OPT)Circular_kernel_arrangement Circular_kernel_arrangement$(OBJ_EXT) $(LDFLAGS)
-
-Circular_kernel_arrangement_Line_arc$(EXE_EXT): Circular_kernel_arrangement_Line_arc$(OBJ_EXT)
-	$(CGAL_CXX) $(LIBPATH) $(EXE_OPT)Circular_kernel_arrangement_Line_arc Circular_kernel_arrangement_Line_arc$(OBJ_EXT) $(LDFLAGS)
-
-Circular_kernel_arrangement_Line_Circular$(EXE_EXT): Circular_kernel_arrangement_Line_Circular$(OBJ_EXT)
-	$(CGAL_CXX) $(LIBPATH) $(EXE_OPT)Circular_kernel_arrangement_Line_Circular Circular_kernel_arrangement_Line_Circular$(OBJ_EXT) $(LDFLAGS)
+	intersecting_arcs$(EXE_EXT)
 
 intersecting_arcs$(EXE_EXT): intersecting_arcs$(OBJ_EXT)
 	$(CGAL_CXX) $(LIBPATH) $(EXE_OPT)intersecting_arcs intersecting_arcs$(OBJ_EXT) $(LDFLAGS)
 
-Lazy_Circular_kernel_arrangement$(EXE_EXT): Lazy_Circular_kernel_arrangement$(OBJ_EXT)
-	$(CGAL_CXX) $(LIBPATH) $(EXE_OPT)Lazy_Circular_kernel_arrangement Lazy_Circular_kernel_arrangement$(OBJ_EXT) $(LDFLAGS)
-
-Lazy_Circular_kernel_arrangement_Line_arc$(EXE_EXT): Lazy_Circular_kernel_arrangement_Line_arc$(OBJ_EXT)
-	$(CGAL_CXX) $(LIBPATH) $(EXE_OPT)Lazy_Circular_kernel_arrangement_Line_arc Lazy_Circular_kernel_arrangement_Line_arc$(OBJ_EXT) $(LDFLAGS)
-
-Lazy_Circular_kernel_arrangement_Line_Circular$(EXE_EXT): Lazy_Circular_kernel_arrangement_Line_Circular$(OBJ_EXT)
-	$(CGAL_CXX) $(LIBPATH) $(EXE_OPT)Lazy_Circular_kernel_arrangement_Line_Circular Lazy_Circular_kernel_arrangement_Line_Circular$(OBJ_EXT) $(LDFLAGS)
-
 clean: \
-	arrangement_random_circles.clean \
-        arrangement_random_circles_segments.clean \
-	Exact_circular_kernel.clean \
-        Circular_kernel_arrangement.clean \
-        Circular_kernel_arrangement_Line_arc.clean \
-        Circular_kernel_arrangement_Line_Circular.clean \
-        intersecting_arcs.clean \
-        Lazy_Circular_kernel_arrangement.clean \
-        Lazy_Circular_kernel_arrangement_Line_arc.clean \
-        Lazy_Circular_kernel_arrangement_Line_Circular.clean 
+        intersecting_arcs.clean 
 
 #---------------------------------------------------------------------#
 #                    suffix rules
diff --git a/Circular_kernel_2/examples/Circular_kernel_2/Lazy_Circular_kernel_arrangement.cpp b/Circular_kernel_2/examples/Circular_kernel_2/Lazy_Circular_kernel_arrangement.cpp
deleted file mode 100644
index a7e3e559465..00000000000
--- a/Circular_kernel_2/examples/Circular_kernel_2/Lazy_Circular_kernel_arrangement.cpp
+++ /dev/null
@@ -1,118 +0,0 @@
-#include <CGAL/basic.h>
-#include <utility>
-#include <CGAL/Cartesian.h>
-#include <CGAL/point_generators_2.h>
-#include <CGAL/MP_Float.h>
-#include <CGAL/Algebraic_kernel_for_circles_2_2.h>
-#include <CGAL/Lazy_circular_kernel_2.h>
-#include <CGAL/intersections.h>
-#include <CGAL/Circular_kernel_2.h>
-#include <CGAL/Timer.h>
-#include <CGAL/Arr_circular_arc_traits.h>
-#include <CGAL/Arr_circular_arc_traits_tracer.h>
-#include <CGAL/Arrangement_2.h>
-#include <CGAL/Arr_naive_point_location.h>
-#include <CGAL/Random.h>
-
-typedef CGAL::Quotient<CGAL::MP_Float>                       NT1;
-typedef CGAL::Cartesian<NT1>                                 Linear_k1;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT1>          Algebraic_k1;
-typedef CGAL::Circular_kernel_2<Linear_k1, Algebraic_k1>     CK1_;
-
-typedef CGAL::Interval_nt_advanced                           NT2;
-typedef CGAL::Cartesian<NT2>                                 Linear_k2;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT2>          Algebraic_k2;
-typedef CGAL::Circular_kernel_2<Linear_k2,Algebraic_k2>      CK2_;
-
-typedef CGAL::Lazy_circular_kernel_2<CK1_,CK2_>                  Circular_k;
-
-typedef Circular_k::Circular_arc_2                            Arc1;
-typedef std::vector<Arc1>                                    ArcContainer;
-
-typedef CK1_::Circular_arc_2                            Arc2;
-typedef std::vector<Arc2>                                    ArcContainer2;
-
-#ifndef CGAL_CURVED_KERNEL_DEBUG
-typedef CGAL::Arr_circular_arc_traits<Circular_k>                  Traits;
-typedef CGAL::Arr_circular_arc_traits<CK1_>                      Traits2;
-#else
-typedef CGAL::Arr_circular_arc_traits<Circular_k>                  Traits0;
-typedef CGAL::Circular_arc_traits_tracer<Traits0>            Traits;
-
-typedef CGAL::Arr_circular_arc_traits<CK1_>                      Traits02;
-typedef CGAL::Circular_arc_traits_tracer<Traits02>           Traits2;
-#endif
-
-//typedef Traits::Point_2                             Point_2;
-typedef Traits::Curve_2                             Conic_arc_2;
-typedef CGAL::Arrangement_2<Traits>                 Pmwx;
-typedef CGAL::Arr_naive_point_location<Pmwx>        Point_location;
-
-//typedef Traits::Point_2                             Point_2_2;
-typedef Traits2::Curve_2                             Conic_arc_2_2;
-typedef CGAL::Arrangement_2<Traits2>                 Pmwx2;
-typedef CGAL::Arr_naive_point_location<Pmwx2>        Point_location2;
-
-typedef Traits2::X_monotone_curve_2                          X_monotone_curve_2_2;
-typedef CK1_::Point_2                     Point_2_2;
-typedef CK1_::Circle_2                    Circle_2_2;
-typedef CK1_::Circular_arc_2              Circular_arc_2_2;
-
-typedef Traits::X_monotone_curve_2            X_monotone_curve_2;
-typedef Circular_k::Point_2                     Point_2;
-typedef Circular_k::Circle_2                    Circle_2;
-typedef Circular_k::Circular_arc_2              Circular_arc_2;
-
-int main(){
-
-  CGAL::Timer clck1,clck2;
-  double t1,t2,t3,t4;
-  CGAL::Random generatorOfgenerator;
-  int random_seed = generatorOfgenerator.get_int(0, 123456);
-  std::cout << "random_seed = " << random_seed << std::endl;
-  CGAL::Random theRandom(random_seed);
-  int random_max = 128;
-  int random_min = -128;
-  ArcContainer ac;
-  ArcContainer2 ac2;
-  int x;
-  int y;
-  for(int i = 0; i < 30; i++){
-    x = theRandom.get_int(random_min,random_max);
-    y = theRandom.get_int(random_min,random_max);
-    ac.push_back( Circle_2( Point_2(x,y), x*x + y*y));
-    ac2.push_back( Circle_2_2( Point_2_2(x,y), x*x + y*y));
-  }
-
-  Pmwx _pm;
-  Point_location _pl(_pm);
-
-  clck1.start();
-  t1=clck1.time();
-  for (ArcContainer::const_iterator it=ac.begin();
-       it != ac.end(); ++it) {
-    //insert(_pm,_pl,*it);
-    insert_curve(_pm,*it,_pl);
-      };
-  t2=clck1.time();
-  clck1.stop();
-
-
-  Pmwx2 _pm2;
-  Point_location2 _pl2(_pm2);
-  clck2.start();
-  t3=clck2.time();
-  for (ArcContainer2::const_iterator it2=ac2.begin();
-       it2 != ac2.end(); ++it2) {
-    //insert(_pm2,_pl2,*it2);
-    insert_curve(_pm2,*it2,_pl2);
-      };
-  t4=clck2.time();
-  clck2.stop();
-
-std::cout<<"Lazy Circular_k ="<<(t2-t1)<<std::endl;
-std::cout<<"Exact Circular_k ="<<(t4-t3)<<std::endl;
-
-
-  return 0;
-};
diff --git a/Circular_kernel_2/examples/Circular_kernel_2/Lazy_Circular_kernel_arrangement_Line_Circular.cpp b/Circular_kernel_2/examples/Circular_kernel_2/Lazy_Circular_kernel_arrangement_Line_Circular.cpp
deleted file mode 100644
index ae9d14c8b94..00000000000
--- a/Circular_kernel_2/examples/Circular_kernel_2/Lazy_Circular_kernel_arrangement_Line_Circular.cpp
+++ /dev/null
@@ -1,182 +0,0 @@
-#include <CGAL/basic.h>
-#include <utility>
-#include <CGAL/Cartesian.h>
-#include <CGAL/point_generators_2.h>
-#include <CGAL/MP_Float.h>
-#include <CGAL/Algebraic_kernel_for_circles_2_2.h>
-#include <CGAL/intersections.h>
-#include <CGAL/Circular_kernel_2.h>
-#include <CGAL/Lazy_circular_kernel_2.h>
-#include <CGAL/Arr_circular_line_arc_traits.h>
-#include <CGAL/Arrangement_2.h>
-#include <CGAL/Arr_naive_point_location.h>
-#include <boost/variant.hpp>
-#include <CGAL/Timer.h>
-
-#include <CGAL/Random.h>
-
-
-typedef CGAL::Quotient<CGAL::MP_Float>                       NT1;
-typedef CGAL::Cartesian<NT1>                                 Linear_k1;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT1>          Algebraic_k1;
-typedef CGAL::Circular_kernel_2<Linear_k1, Algebraic_k1>     CK1_;
-
-typedef CGAL::Interval_nt_advanced                           NT2;
-typedef CGAL::Cartesian<NT2>                                 Linear_k2;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT2>          Algebraic_k2;
-typedef CGAL::Circular_kernel_2<Linear_k2,Algebraic_k2>      CK2_;
-
-typedef CGAL::Lazy_circular_kernel_2<CK1_,CK2_>              Circular_k;
-
-
-typedef Circular_k::Point_2                           Point_2;
-typedef Circular_k::Circle_2                          Circle_2;
-typedef Circular_k::Circular_arc_2                    Circular_arc_2;
-typedef Circular_k::Line_arc_2                        Line_arc_2;
-
-typedef CK1_::Point_2                           Point_2_2;
-typedef CK1_::Circle_2                          Circle_2_2;
-typedef CK1_::Circular_arc_2                    Circular_arc_2_2;
-typedef CK1_::Line_arc_2                        Line_arc_2_2;
-
-
-//typedef Circular_k::Circular_arc_2                            Arc;
-//typedef Circular_k::Line_arc_2                                Arc;
-typedef boost::variant< Circular_arc_2, Line_arc_2 >        Arc1;
-typedef boost::variant< Circular_arc_2_2, Line_arc_2_2 >        Arc2;
-
-typedef std::vector< Arc1> ArcContainer;
-typedef std::vector< Arc2> ArcContainer2;
-
-#ifndef CGAL_CURVED_KERNEL_DEBUG
-typedef CGAL::Arr_circular_line_arc_traits<Circular_k,Circular_k::Line_arc_2,
-                                      Circular_k::Circular_arc_2>  Traits;
-
-typedef CGAL::Arr_circular_line_arc_traits<CK1_,CK1_::Line_arc_2,
-                                  CK1_::Circular_arc_2>          Traits2;
-#else
-typedef CGAL::Arr_circular_line_arc_traits<Circular_k,Circular_k::Line_arc_2,
-                                      Circular_k::Circular_arc_2>  Traits0;
-
-typedef CGAL::Arr_circular_line_arc_traits_tracer<Traits0>            Traits;
-
-typedef CGAL::Arr_circular_line_arc_traits<CK1_,CK1_::Line_arc_2,
-                                  CK1_::Circular_arc_2>          Traits02;
-typedef CGAL::Arr_circular_line_arc_traits_tracer<Traits02>           Traits2;
-
-#endif
-
-
-typedef Traits::Curve_2                             Conic_arc_2;
-typedef CGAL::Arrangement_2<Traits>                 Pmwx;
-typedef CGAL::Arr_naive_point_location<Pmwx>        Point_location;
-
-typedef Traits::X_monotone_curve_2                  X_monotone_curve_2;
-
-typedef Traits2::Curve_2                             Conic_arc_2_2;
-typedef CGAL::Arrangement_2<Traits2>                 Pmwx2;
-typedef CGAL::Arr_naive_point_location<Pmwx2>        Point_location2;
-
-typedef Traits2::X_monotone_curve_2                  X_monotone_curve_2_2;
-
-
-
-int main(){
-
-  CGAL::Random generatorOfgenerator;
-  int random_seed = generatorOfgenerator.get_int(0, 123456);
-  std::cout << "random_seed = " << random_seed << std::endl;
-  CGAL::Random theRandom(random_seed);
-  int random_max = 128;
-  int random_min = -128;
-
-  ArcContainer ac;
-  ArcContainer2 ac2;
-
-  CGAL::Timer clck1,clck2;
-  double t1,t2,t3,t4;
-
-  int x1;
-  int y1;
-  int x2;
-  int y2;
-  //double x1, y1, x2, y2;
-
-  for(int i = 0; i < 200; i++){
-    x1 = theRandom.get_int(random_min,random_max);
-    y1 = theRandom.get_int(random_min,random_max);
-    //x1 = theRandom.get_double(random_min,random_max);
-    //y1 = theRandom.get_double(random_min,random_max);
-    do{
-      x2 = theRandom.get_int(random_min,random_max);
-      y2 = theRandom.get_int(random_min,random_max);
-      //x2 = theRandom.get_double(random_min,random_max);
-      //y2 = theRandom.get_double(random_min,random_max);
-    }while((x1 == x2) && (y1 == y2));
-
-    std::cout << x1 << " "
-  	      << y1 << " "
-  	      << x2 << " "
-  	      << y2 << std::endl;
-    boost::variant< Circular_arc_2, Line_arc_2 > v =  Line_arc_2(Point_2(x1,y1), Point_2(x2,y2));
-    ac.push_back( v);
-
-    boost::variant< Circular_arc_2_2, Line_arc_2_2 > v2 =  Line_arc_2_2(Point_2_2(x1,y1), Point_2_2(x2,y2));
-    ac2.push_back( v2);
-
-  }
-
-   for(int i = 0; i < 10; i++){
-    x1 = theRandom.get_int(random_min,random_max);
-    y1 = theRandom.get_int(random_min,random_max);
-    boost::variant< Circular_arc_2, Line_arc_2 > v = Circle_2( Point_2(x1,y1), x1*x1 + y1*y1);
-    ac.push_back(v);
-
-    boost::variant< Circular_arc_2_2, Line_arc_2_2 > v2 = Circle_2_2( Point_2_2(x1,y1), x1*x1 + y1*y1);
-    ac2.push_back(v2);
-  }
-
-
-
-  Pmwx _pm;
-  Point_location _pl(_pm);
-
-  clck1.start();
-
-  t1=clck1.time();
-
-
-  for (ArcContainer::const_iterator it=ac.begin();
-       it != ac.end(); ++it) {
-    //insert(_pm,_pl,*it);
-    insert_curve(_pm,*it,_pl);
-      };
-
-  t2=clck1.time();
-
-  clck1.stop();
-
-
-  Pmwx2 _pm2;
-  Point_location2 _pl2(_pm2);
-
-  clck2.start();
-
-  t3=clck2.time();
-
-
-  for (ArcContainer2::const_iterator it2=ac2.begin();
-       it2 != ac2.end(); ++it2) {
-    //insert(_pm,_pl,*it);
-    insert_curve(_pm2,*it2,_pl2);
-      };
-
-  t4=clck2.time();
-
-  clck2.stop();
-
-  std::cout<<"Lazy Circular_k ="<<(t2-t1)<<std::endl;
-  std::cout<<"Exact Circular_k ="<<(t4-t3)<<std::endl;
-
-  return 0;
-};
diff --git a/Circular_kernel_2/examples/Circular_kernel_2/Lazy_Circular_kernel_arrangement_Line_arc.cpp b/Circular_kernel_2/examples/Circular_kernel_2/Lazy_Circular_kernel_arrangement_Line_arc.cpp
deleted file mode 100644
index 9a5594a481d..00000000000
--- a/Circular_kernel_2/examples/Circular_kernel_2/Lazy_Circular_kernel_arrangement_Line_arc.cpp
+++ /dev/null
@@ -1,142 +0,0 @@
-#include <CGAL/basic.h>
-#include <utility>
-#include <CGAL/Cartesian.h>
-#include <CGAL/point_generators_2.h>
-#include <CGAL/MP_Float.h>
-#include <CGAL/Algebraic_kernel_for_circles_2_2.h>
-#include <CGAL/Lazy_circular_kernel_2.h>
-#include <CGAL/intersections.h>
-#include <CGAL/Circular_kernel_2.h>
-#include <CGAL/Arr_line_arc_traits.h>
-#include <CGAL/Timer.h>
-#include <CGAL/Arrangement_2.h>
-#include <CGAL/Arr_naive_point_location.h>
-#include <CGAL/Random.h>
-
-
-typedef CGAL::Quotient<CGAL::MP_Float>                       NT1;
-typedef CGAL::Cartesian<NT1>                                 Linear_k1;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT1>          Algebraic_k1;
-typedef CGAL::Circular_kernel_2<Linear_k1, Algebraic_k1>     CK1_;
-
-typedef CGAL::Interval_nt_advanced                           NT2;
-typedef CGAL::Cartesian<NT2>                                 Linear_k2;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT2>          Algebraic_k2;
-typedef CGAL::Circular_kernel_2<Linear_k2,Algebraic_k2>      CK2_;
-
-typedef CGAL::Lazy_circular_kernel_2<CK1_,CK2_>              Circular_k;
-
-typedef Circular_k::Line_arc_2                               Arc1;
-typedef std::vector<Arc1>                                    ArcContainer;
-
-typedef CK1_::Line_arc_2                                     Arc2;
-typedef std::vector<Arc2>                                    ArcContainer2;
-
-#ifndef CGAL_CURVED_KERNEL_DEBUG
-typedef CGAL::Arr_line_arc_traits<Circular_k>                  Traits;
-typedef CGAL::Arr_line_arc_traits<CK1_>                      Traits2;
-#else
-typedef CGAL::Arr_line_arc_traits<Circular_k>                  Traits0;
-typedef CGAL::Circular_arc_traits_tracer<Traits0>            Traits;
-
-typedef CGAL::Arr_line_arc_traits<CK1_>                      Traits02;
-typedef CGAL::Circular_arc_traits_tracer<Traits02>           Traits2;
-#endif
-
-
-typedef Traits::Curve_2                             Conic_arc_2;
-typedef CGAL::Arrangement_2<Traits>                 Pmwx;
-typedef CGAL::Arr_naive_point_location<Pmwx>        Point_location;
-
-
-//typedef Traits::Point_2                             Point_2_2;
-typedef Traits2::Curve_2                             Conic_arc_2_2;
-typedef CGAL::Arrangement_2<Traits2>                 Pmwx2;
-typedef CGAL::Arr_naive_point_location<Pmwx2>        Point_location2;
-
-
-
-typedef Traits::X_monotone_curve_2                  X_monotone_curve_2;
-typedef Circular_k::Point_2                           Point_2;
-typedef CK1_::Point_2                               Point_2_2;
-typedef Circular_k::Circle_2                          Circle_2;
-typedef Circular_k::Circular_arc_2                    Circular_arc_2;
-typedef Circular_k::Line_arc_2                        Line_arc_2;
-typedef CK1_::Line_arc_2                            Line_arc_2_2;
-int main(){
-
-
-
-
-  CGAL::Random generatorOfgenerator;
-  int random_seed = generatorOfgenerator.get_int(0, 123456);
-  //std::cout << "random_seed = " << random_seed << std::endl;
-  CGAL::Random theRandom(random_seed);
-  int random_max = 5;
-  int random_min = -5;
- // for(int j = 0; j < 10 ; j++){
-
-  ArcContainer ac;
-  ArcContainer2 ac2;
-  int x1,y1,x2,y2;
-  double t1,t2,t3,t4;
-  CGAL::Timer clck1,clck2;
-
-    for(int i = 0; i < 100; i++){
-      x1 = theRandom.get_int(random_min,random_max);
-      y1 = theRandom.get_int(random_min,random_max);
-      do{
-   	x2 = theRandom.get_int(random_min,random_max);
-   	y2 = theRandom.get_int(random_min,random_max);
-      }while((x1 == x2) && (y1 == y2));
-
-
-      std::cout << x1 << " "
-   		<< y1 << " "
-   		<< x2 << " "
-   		<< y2 << std::endl;
-      ac.push_back( Line_arc_2(Point_2(x1,y1), Point_2(x2,y2)));
-      ac2.push_back( Line_arc_2_2(Point_2_2(x1,y1), Point_2_2(x2,y2)));
-    }
-
-//  while(std::cin >> x1 >> y1 >> x2 >> y2){
-//    ac.push_back( Line_arc_2(Point_2(x1,y1), Point_2(x2,y2)));
-//    ac2.push_back( Line_arc_2_2(Point_2_2(x1,y1), Point_2_2(x2,y2)));
-//  }
-
-
-    Pmwx _pm;
-    Point_location _pl(_pm);
-
-    clck1.start();
-    t1=clck1.time();
-    for (ArcContainer::const_iterator it=ac.begin();
-	 it != ac.end(); ++it) {
-      //insert(_pm,_pl,*it);
-      insert_curve(_pm,*it,_pl);
-    };
-    t2=clck1.time();
-
-    clck1.stop();
-
-    Pmwx2 _pm2;
-    Point_location2 _pl2(_pm2);
-
-    clck2.start();
-    t3=clck2.time();
-    for (ArcContainer2::const_iterator it2=ac2.begin();
-	 it2 != ac2.end(); ++it2) {
-      //insert(_pm2,_pl2,*it2);
-      insert_curve(_pm2,*it2,_pl2);
-    };
-    t4=clck2.time();
-
-    clck2.stop();
-
-    std::cout<<"Lazy Circular_k ="<<(t2-t1)<<std::endl;
-    std::cout<<"Exact Circular_k ="<<(t4-t3)<<std::endl;
-
-
- // }
-  return 0;
-};
diff --git a/Circular_kernel_2/examples/Circular_kernel_2/arrangement_random_circles.cpp b/Circular_kernel_2/examples/Circular_kernel_2/arrangement_random_circles.cpp
deleted file mode 100644
index ca3491ca09b..00000000000
--- a/Circular_kernel_2/examples/Circular_kernel_2/arrangement_random_circles.cpp
+++ /dev/null
@@ -1,50 +0,0 @@
-#include <CGAL/Cartesian.h>
-#include <CGAL/Random.h>
-#include <CGAL/point_generators_2.h>
-#include <CGAL/MP_Float.h>
-#include <CGAL/Algebraic_kernel_for_circles_2_2.h>
-#include <CGAL/Circular_kernel_2.h>
-#include <CGAL/Arr_circular_arc_traits.h>
-#include <CGAL/Arrangement_2.h>
-#include <CGAL/Arr_naive_point_location.h>
-
-typedef CGAL::Quotient<CGAL::MP_Float>                  NT;
-typedef CGAL::Cartesian<NT>                             Linear_k;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT>      Algebraic_k;
-typedef CGAL::Circular_kernel_2<Linear_k,Algebraic_k>   Circular_k;
-
-typedef Circular_k::Point_2                             Point_2;
-typedef Circular_k::Circle_2                            Circle_2;
-typedef Circular_k::Circular_arc_2                      Circular_arc_2;
-typedef std::vector<Circular_arc_2>                     ArcContainer;
-
-typedef CGAL::Arr_circular_arc_traits<Circular_k>       Traits;
-
-typedef CGAL::Arrangement_2<Traits>                     Arr;
-typedef CGAL::Arr_naive_point_location<Arr>             Point_location;
-
-int main(){
-
-  CGAL::Random generatorOfgenerator;
-  int random_seed = generatorOfgenerator.get_int(0, 123456);
-  std::cout << "random_seed = " << random_seed << std::endl;
-  CGAL::Random theRandom(random_seed);
-  int random_max = 128;
-  int random_min = -128;
-  ArcContainer ac;
-  int x, y;
-
-  for (int i = 0; i < 10; i++) {
-    x = theRandom.get_int(random_min,random_max);
-    y = theRandom.get_int(random_min,random_max);
-    ac.push_back( Circle_2( Point_2(x,y), x*x + y*y));
-  }
-
-  Arr  arr;
-  Point_location _pl(arr);
-  for (ArcContainer::const_iterator it=ac.begin(); it != ac.end(); ++it) {
-    insert_curve(arr, *it, _pl);
-  };
-
-  return 0;
-};
diff --git a/Circular_kernel_2/examples/Circular_kernel_2/arrangement_random_circles_segments.cpp b/Circular_kernel_2/examples/Circular_kernel_2/arrangement_random_circles_segments.cpp
deleted file mode 100644
index 5e8ea0c4c47..00000000000
--- a/Circular_kernel_2/examples/Circular_kernel_2/arrangement_random_circles_segments.cpp
+++ /dev/null
@@ -1,70 +0,0 @@
-#include <CGAL/Cartesian.h>
-#include <CGAL/Random.h>
-#include <CGAL/point_generators_2.h>
-#include <CGAL/MP_Float.h>
-#include <CGAL/Algebraic_kernel_for_circles_2_2.h>
-#include <CGAL/Circular_kernel_2.h>
-#include <CGAL/Arr_circular_line_arc_traits.h>
-#include <CGAL/Arrangement_2.h>
-#include <CGAL/Arr_naive_point_location.h>
-
-typedef CGAL::Quotient<CGAL::MP_Float>                  NT;
-typedef CGAL::Cartesian<NT>                             Linear_k;
-typedef CGAL::Algebraic_kernel_for_circles_2_2<NT>      Algebraic_k;
-typedef CGAL::Circular_kernel_2<Linear_k,Algebraic_k>   Circular_k;
-typedef Circular_k::Point_2                             Point_2;
-typedef Circular_k::Circle_2                            Circle_2;
-typedef Circular_k::Circular_arc_2                      Circular_arc_2;
-typedef Circular_k::Line_arc_2                          Line_arc_2;
-
-typedef boost::variant< Circular_arc_2, Line_arc_2>     Arc_2;
-typedef std::vector< Arc_2>                             ArcContainer;
-
-typedef CGAL::Arr_circular_line_arc_traits
-<Circular_k, Circular_arc_2, Line_arc_2>                Traits;
-
-typedef CGAL::Arrangement_2<Traits>                     Arr;
-typedef CGAL::Arr_naive_point_location<Arr>             Point_location;
-
-int main(){
-
-  CGAL::Random generatorOfgenerator;
-  int random_seed = generatorOfgenerator.get_int(0, 123456);
-  std::cout << "random_seed = " << random_seed << std::endl;
-  CGAL::Random theRandom(random_seed);
-  int random_max = 128;
-  int random_min = -128;
-  ArcContainer ac;
-  int x1, y1, x2, y2;
-
-  for (int i = 0; i < 10; i++) {
-    x1 = theRandom.get_int(random_min,random_max);
-    y1 = theRandom.get_int(random_min,random_max);
-    do{
-      x2 = theRandom.get_int(random_min,random_max);
-      y2 = theRandom.get_int(random_min,random_max);
-    } while((x1 == x2) && (y1 == y2));
-    std::cout << x1 << " " << y1 << " " << x2 << " " << y2 << std::endl;
-
-    boost::variant< Circular_arc_2, Line_arc_2 >
-      v =  Line_arc_2(Point_2(x1,y1), Point_2(x2,y2));
-    ac.push_back( v);
-  }
-
-   for (int i = 0; i < 10; i++) {
-    x1 = theRandom.get_int(random_min,random_max);
-    y1 = theRandom.get_int(random_min,random_max);
-
-    boost::variant< Circular_arc_2, Line_arc_2 >
-      v = Circle_2( Point_2(x1,y1), x1*x1 + y1*y1);
-    ac.push_back(v);
-   }
-
-  Arr arr;
-  Point_location _pl(arr);
-  for (ArcContainer::const_iterator it=ac.begin(); it != ac.end(); ++it) {
-    insert_curve(arr, *it, _pl);
-  };
-
-  return 0;
-};