diff --git a/Combinatorial_map/examples/Combinatorial_map/map_3_index.cpp b/Combinatorial_map/examples/Combinatorial_map/map_3_index.cpp
index 4165523cc58..d44beb8185c 100644
--- a/Combinatorial_map/examples/Combinatorial_map/map_3_index.cpp
+++ b/Combinatorial_map/examples/Combinatorial_map/map_3_index.cpp
@@ -1,7 +1,8 @@
 #include <CGAL/Combinatorial_map.h>
 #include <CGAL/Cell_attribute.h>
-#include <iostream>
+#include <vector>
 #include <algorithm>
+#include <string>
 #include <cstdlib>
 
 struct Myitem
@@ -11,68 +12,43 @@ struct Myitem
   template<class CMap>
   struct Dart_wrapper
   {
-    typedef CGAL::Cell_attribute<CMap, int> Vol_attrib;
+    typedef CGAL::Cell_attribute<CMap> Vol_attrib;
     typedef std::tuple<void,void,void,Vol_attrib> Attributes;
   };
 };
 
-typedef CGAL::Combinatorial_map<3,Myitem> CMap_3;
-typedef CMap_3::Dart_descriptor           Dart_descriptor;
+using CMap_3=CGAL::Combinatorial_map<3,Myitem>;
+using Dart_descriptor=CMap_3::Dart_descriptor;
 
 int main()
 {
   CMap_3 cm;
 
   // Create 2 hexahedra.
-  Dart_descriptor d1 = cm.make_combinatorial_hexahedron();
-  Dart_descriptor d2 = cm.make_combinatorial_hexahedron();
+  Dart_descriptor d1=cm.make_combinatorial_hexahedron();
+  Dart_descriptor d2=cm.make_combinatorial_hexahedron();
+  cm.sew<3>(d1, d2); // 3-Sew the two hexahedra along one facet.
+  
+  // Create two 3-attributes and associated them to darts.
+  cm.set_attribute<3>(d1, cm.create_attribute<3>());
+  cm.set_attribute<3>(d2, cm.create_attribute<3>());
 
-  // 1) Create all 2-attributes and associated them to darts.
-  for (CMap_3::Dart_range::iterator
-       it=cm.darts().begin(), itend=cm.darts().end();
-       it!=itend; ++it)
-  {
-    if ( cm.attribute<2>(it)==CMap_3::null_descriptor )
-      cm.set_attribute<2>(it, cm.create_attribute<2>());
-  }
+  // Associate a vector of size_t to darts
+  std::vector<std::size_t> array_for_darts(cm.upper_bound_on_dart_ids());
+  std::generate(array_for_darts.begin(), array_for_darts.end(), std::rand);
 
-  // 2) Set the color of all facets of the first hexahedron to 7.
-  for (CMap_3::One_dart_per_incident_cell_range<2, 3>::iterator
-       it=cm.one_dart_per_incident_cell<2,3>(d1).begin(),
-       itend=cm.one_dart_per_incident_cell<2,3>(d1).end(); it!=itend; ++it)
-  { cm.info<2>(it)=7; }
+  // Associate a vector of string to 3-attributes
+  std::vector<std::string> array_for_vols(cm.upper_bound_on_attribute_ids<3>());
+  std::size_t i=0;
+  for(auto& e: array_for_vols)
+  { e="vol"+std::to_string(i++); }
 
-  // 3) Set the color of all facets of the second hexahedron to 13.
-  for (CMap_3::One_dart_per_incident_cell_range<2, 3>::iterator it=
-       cm.one_dart_per_incident_cell<2,3>(d2).begin(),
-       itend=cm.one_dart_per_incident_cell<2,3>(d2).end(); it!=itend; ++it)
-  { cm.info<2>(it)=13; }
-
-  // 4) 3-Sew the two hexahedra along one facet.
-  cm.sew<3>(d1, d2);
-
-  // 5) Display all the values of 2-attributes.
-  for (CMap_3::Attribute_range<2>::type::iterator
-       it=cm.attributes<2>().begin(), itend=cm.attributes<2>().end();
-       it!=itend; ++it)
-  {
-    std::cout<<cm.info_of_attribute<2>(it)<<"; ";
-  }
-  std::cout<<std::endl;
-
-  // 6) Insert a vertex in the facet between the two hexahedra.
-  cm.insert_cell_0_in_cell_2(d2);
-
-  // 7) Display all the values of 2-attributes.
-  for (CMap_3::Attribute_range<2>::type::iterator
-       it=cm.attributes<2>().begin(), itend=cm.attributes<2>().end();
-       it!=itend; ++it)
-  {
-    std::cout<<cm.info_of_attribute<2>(it)<<"; ";
-  }
-  std::cout<<std::endl;
-  cm.display_characteristics(std::cout);
-  std::cout<<", valid="<<cm.is_valid()<<std::endl;
+  std::cout<<"Value in array for darts d1 and d2: "
+           <<array_for_darts[d1]<<" and "<<array_for_darts[d2]<<std::endl;
 
+  std::cout<<"Value in array for volumes of dart d1 and d2: "
+           <<array_for_vols[cm.attribute<3>(d1)]<<" and "
+           <<array_for_vols[cm.attribute<3>(d2)]<<std::endl;
+  
   return EXIT_SUCCESS;
 }