diff --git a/2-ObjectProgramming/3-constructors-destructor.ipynb b/2-ObjectProgramming/3-constructors-destructor.ipynb
index 5cb7ac333e39f66d175b9ae54fcd9ee63af90640..59c681f68f69295065b4f766dd94c025524c164b 100644
--- a/2-ObjectProgramming/3-constructors-destructor.ipynb
+++ b/2-ObjectProgramming/3-constructors-destructor.ipynb
@@ -75,7 +75,7 @@
    "outputs": [],
    "source": [
     "Vector::Vector()\n",
-    ": x_(0.), // \n",
+    ": x_0.),\n",
     "y_(0.),\n",
     "z_(0.)\n",
     "{ }"
@@ -210,7 +210,7 @@
     "    \n",
     "    Vector2();\n",
     "    \n",
-    "    Vector2(double xyz);\n",
+    "    Vector2(double x);\n",
     "    \n",
     "    Vector2(double x, double y, double z);\n",
     "    \n",
@@ -459,7 +459,7 @@
    "source": [
     "struct SafeClass\n",
     "{\n",
-    "    int a_ = 5; // The default value is provided here in the class declaration.        \n",
+    "    int a_ { 5 }; // The default value is provided here in the class declaration.        \n",
     "    \n",
     "    SafeClass() = default;\n",
     "    \n",
@@ -624,7 +624,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -645,7 +645,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -658,7 +658,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -673,20 +673,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Memory for array 3 is properly freed here.\n",
-      "Memory for array 4 is properly freed here.\n",
-      "Memory for array 2 is properly freed here.\n",
-      "Memory for array 1 is properly freed here.\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    Array array1(1, 5ul);\n",
diff --git a/2-ObjectProgramming/4-encapsulation.ipynb b/2-ObjectProgramming/4-encapsulation.ipynb
index 73a7e9f76919d44db420a17c56550ca97a7e641b..b21da9167b78af773202707cfb762265b7293ccf 100644
--- a/2-ObjectProgramming/4-encapsulation.ipynb
+++ b/2-ObjectProgramming/4-encapsulation.ipynb
@@ -81,7 +81,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -105,7 +105,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -117,7 +117,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -131,7 +131,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -143,17 +143,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "The value is 5\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    SecondClass object(5);\n",
@@ -163,31 +155,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_13:4:12: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1m'SetValue' is a private member of 'SecondClass'\u001b[0m\n",
-      "    object.SetValue(7); // COMPILATION ERROR: trying to call publicly a private method\n",
-      "\u001b[0;1;32m           ^\n",
-      "\u001b[0m\u001b[1minput_line_7:11:14: \u001b[0m\u001b[0;1;30mnote: \u001b[0mdeclared private here\u001b[0m\n",
-      "        void SetValue(int a);\n",
-      "\u001b[0;1;32m             ^\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    SecondClass object(5);\n",
@@ -222,13 +192,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
     "struct Rectangle\n",
     "{\n",
-    "    Rectangle(double length, double widgth);\n",
+    "    Rectangle(double length, double width);\n",
     "\n",
     "    double length_;\n",
     "    double width_;\n",
@@ -240,7 +210,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -253,31 +223,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_19:1:17: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1mredefinition of 'Print'\u001b[0m\n",
-      "void Rectangle::Print() const\n",
-      "\u001b[0;1;32m                ^\n",
-      "\u001b[0m\u001b[1minput_line_17:1:17: \u001b[0m\u001b[0;1;30mnote: \u001b[0mprevious definition is here\u001b[0m\n",
-      "void Rectangle::Print() const\n",
-      "\u001b[0;1;32m                ^\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
    "source": [
     "#include <iostream>\n",
     "\n",
@@ -289,18 +237,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "My rectangle is 5 x 4 so its area is 20\n",
-      "My rectangle is 23 x 4 so its area is 20\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    Rectangle rect(5., 4.);    \n",
@@ -319,7 +258,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -340,7 +279,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -353,7 +292,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -367,31 +306,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 15,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_25:5:10: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1m'length_' is a private member of 'MoreSecureRectangle'\u001b[0m\n",
-      "    rect.length_ = 0.; // can't do that!   \n",
-      "\u001b[0;1;32m         ^\n",
-      "\u001b[0m\u001b[1minput_line_21:9:16: \u001b[0m\u001b[0;1;30mnote: \u001b[0mdeclared private here\u001b[0m\n",
-      "        double length_;\n",
-      "\u001b[0;1;32m               ^\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    MoreSecureRectangle rect(5., 4.);    \n",
@@ -409,7 +326,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 16,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -433,7 +350,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -446,7 +363,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 18,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -460,7 +377,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -473,7 +390,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 20,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -486,18 +403,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 21,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "My rectangle is 5 x 4 so its area is 20\n",
-      "My rectangle is 23 x 4 so its area is 92\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    Rectangle3 rect(5., 4.);    \n",
@@ -530,7 +438,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 22,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -550,14 +458,14 @@
     "\n",
     "    private:\n",
     "        \n",
-    "        double length_ = -1.20; // a stupid value which at least is deterministically known...\n",
-    "        double width_ = -1.20;\n",
+    "        double length_ = -1.e20; // a stupid value which at least is deterministically known...\n",
+    "        double width_ = -1.e20;\n",
     "};"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 23,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -569,7 +477,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 24,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -581,7 +489,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 25,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -593,7 +501,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -605,7 +513,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 27,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -617,7 +525,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 28,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -629,18 +537,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 29,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Area = 26\n",
-      "Area = 20\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "#include <iostream>\n",
     "\n",
@@ -665,7 +564,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 30,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -700,7 +599,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 31,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -712,7 +611,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 32,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -726,7 +625,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 33,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -738,7 +637,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 34,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -751,7 +650,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 35,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -764,7 +663,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 36,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -778,19 +677,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 37,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Area is 12\n",
-      "Area is 32\n",
-      "Area is 16\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    Rectangle5 rect(3., 4.);\n",
@@ -826,7 +715,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 38,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -852,7 +741,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 39,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -865,7 +754,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 40,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -879,7 +768,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 41,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -899,7 +788,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 42,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -910,7 +799,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 43,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
diff --git a/2-ObjectProgramming/6-inheritance.ipynb b/2-ObjectProgramming/6-inheritance.ipynb
index 37a03e94b4da4440af689dd528e784da4db51855..89a7e751b829d53d5e0b8c2b0d9cf435e8dea22b 100644
--- a/2-ObjectProgramming/6-inheritance.ipynb
+++ b/2-ObjectProgramming/6-inheritance.ipynb
@@ -25,14 +25,14 @@
     "\n",
     "Sometimes, you might want to define two types that are related: one might be an extension of the other, or they may share some similarities we would like to put in common.\n",
     "\n",
-    "Let's suppose for instance you are asked to register all vehicles owned by your company. You could define independent classes `Bicyle`, `Scooter` and `Car`, but as a result storing them in a same `std::vector` would be impossible. \n",
+    "Let's suppose for instance you are asked to register all vehicles owned by your company. You could define independent classes `Bicycle`, `Scooter` and `Car`, but as a result storing them in a same `std::vector` would be impossible. \n",
     "\n",
     "The idea of inheritance is to provide a **base class** from which our classes are derived:"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -50,7 +50,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -61,7 +61,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -76,7 +76,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -91,7 +91,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -102,7 +102,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -131,7 +131,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -145,7 +145,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -159,7 +159,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -173,7 +173,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -198,7 +198,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -228,7 +228,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -240,7 +240,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -252,7 +252,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -264,7 +264,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 15,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -276,7 +276,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 16,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -288,7 +288,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -302,7 +302,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 18,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -317,7 +317,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -335,7 +335,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 20,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -348,22 +348,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 21,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      " ==== RECTANGLE ==== \n",
-      "My rectangle gets a length of 5 and a width of 3\n",
-      "My rectangle gets a length of 2.5 and a width of 6\n",
-      " ==== SQUARE ==== \n",
-      "My rectangle gets a length of 4 and a width of 4\n",
-      "My rectangle gets a length of 2 and a width of 8\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    std::cout << \" ==== RECTANGLE ==== \" << std::endl;\n",
@@ -402,7 +389,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 22,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -417,7 +404,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 23,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -428,40 +415,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 24,
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_32:4:12: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1m'SetWidth' is a private member of 'Rectangle'\u001b[0m\n",
-      "    square.SetWidth(5.); // COMPILATION ERROR!\n",
-      "\u001b[0;1;32m           ^\n",
-      "\u001b[0m\u001b[1minput_line_30:1:17: \u001b[0m\u001b[0;1;30mnote: \u001b[0mconstrained by private inheritance here\u001b[0m\n",
-      "class Square2 : private Rectangle\n",
-      "\u001b[0;1;32m                ^~~~~~~~~~~~~~~~~\n",
-      "\u001b[0m\u001b[1minput_line_22:1:17: \u001b[0m\u001b[0;1;30mnote: \u001b[0mmember is declared here\u001b[0m\n",
-      "void Rectangle::SetWidth(double x)\n",
-      "\u001b[0;1;32m                ^\n",
-      "\u001b[0m\u001b[1minput_line_32:4:5: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1mcannot cast 'Square2' to its private base class 'Rectangle'\u001b[0m\n",
-      "    square.SetWidth(5.); // COMPILATION ERROR!\n",
-      "\u001b[0;1;32m    ^\n",
-      "\u001b[0m\u001b[1minput_line_30:1:17: \u001b[0m\u001b[0;1;30mnote: \u001b[0mdeclared private here\u001b[0m\n",
-      "class Square2 : private Rectangle\n",
-      "\u001b[0;1;32m                ^~~~~~~~~~~~~~~~~\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
    "source": [
     "{\n",
     "    Square2 square(4.);\n",
@@ -478,31 +434,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 25,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_33:4:21: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1mcannot cast 'Square2' to its private base class 'Rectangle'\u001b[0m\n",
-      "    ModifyRectangle(square);\n",
-      "\u001b[0;1;32m                    ^\n",
-      "\u001b[0m\u001b[1minput_line_30:1:17: \u001b[0m\u001b[0;1;30mnote: \u001b[0mdeclared private here\u001b[0m\n",
-      "class Square2 : private Rectangle\n",
-      "\u001b[0;1;32m                ^~~~~~~~~~~~~~~~~\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    Square2 square(4.);\n",
@@ -521,7 +455,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -539,7 +473,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 27,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -550,7 +484,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 28,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -563,18 +497,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 29,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "My rectangle gets a length of 4 and a width of 4\n",
-      "My rectangle gets a length of 3 and a width of 3\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    Square3 square(4.);\n",
@@ -597,7 +522,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 30,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -625,7 +550,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 31,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -637,7 +562,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 32,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -649,7 +574,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 33,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -661,7 +586,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 34,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -675,7 +600,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 35,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -687,18 +612,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 36,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "My rectangle gets a length of 4 and a width of 4\n",
-      "My rectangle gets a length of 3 and a width of 3\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    Square4 square(4.);\n",
@@ -743,7 +659,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 37,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -762,7 +678,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 38,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -776,35 +692,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 39,
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_47:3:5: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1m'DoNothing' is a private member of 'BaseClass'\u001b[0m\n",
-      "    DoNothing()\n",
-      "\u001b[0;1;32m    ^\n",
-      "\u001b[0m\u001b[1minput_line_45:9:14: \u001b[0m\u001b[0;1;30mnote: \u001b[0mdeclared private here\u001b[0m\n",
-      "        void DoNothing() { }\n",
-      "\u001b[0;1;32m             ^\n",
-      "\u001b[0m\u001b[1minput_line_47:3:16: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1mexpected ';' after expression\u001b[0m\n",
-      "    DoNothing()\n",
-      "\u001b[0;1;32m               ^\n",
-      "\u001b[0m\u001b[0;32m               ;\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
    "source": [
     "DerivedClass::DerivedClass()\n",
     "{\n",
@@ -821,7 +711,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 40,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -840,7 +730,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 41,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -854,7 +744,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 42,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -895,7 +785,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 43,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -909,7 +799,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 44,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -925,7 +815,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 45,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -937,7 +827,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 46,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -953,7 +843,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 47,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -965,28 +855,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 48,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_56:7:13: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1mno member named 'Nwheels' in 'Vehicle2'\u001b[0m\n",
-      "    list[0].Nwheels(); // COMPILATION ERROR\n",
-      "\u001b[0;1;32m    ~~~~~~~ ^\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    Bicycle2 b;\n",
@@ -1008,7 +879,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 49,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1044,7 +915,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 50,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1056,7 +927,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 51,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1068,7 +939,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 52,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1080,18 +951,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 53,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Nwheels = 0\n",
-      "Nwheels = 0\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "#include <iostream>\n",
     "{\n",
@@ -1131,7 +993,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 54,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1166,7 +1028,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 55,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1178,7 +1040,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 56,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1190,7 +1052,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 57,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1216,7 +1078,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 58,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1248,28 +1110,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 59,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_68:6:21: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1m'Nwhels' marked 'override' but does not override any member functions\u001b[0m\n",
-      "        virtual int Nwhels() const override; // Please notice the missing 'e', that now triggers a compilation error!\n",
-      "\u001b[0;1;32m                    ^\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "class Car4_typo_override : public Vehicle4_typo\n",
     "{\n",
@@ -1290,18 +1133,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 60,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Nwheels = 0\n",
-      "Nwheels = 0\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "#include <iostream>\n",
     "{\n",
@@ -1326,18 +1160,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 61,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Nwheels = 2\n",
-      "Nwheels = 4\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "#include <iostream>\n",
     "{\n",
@@ -1365,19 +1190,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 62,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Nwheels = 2\n",
-      "Nwheels = 4\n",
-      "Nwheels = 0\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "#include <iostream>\n",
     "{\n",
@@ -1409,7 +1224,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 63,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1444,7 +1259,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 64,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1456,7 +1271,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 65,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1468,31 +1283,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 66,
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_78:3:14: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1mvariable type 'Vehicle5' is an abstract class\u001b[0m\n",
-      "    Vehicle5 v; // Compilation error: you can't instantiate an abstract class!\n",
-      "\u001b[0;1;32m             ^\n",
-      "\u001b[0m\u001b[1minput_line_75:6:21: \u001b[0m\u001b[0;1;30mnote: \u001b[0munimplemented pure virtual method 'Nwheels' in 'Vehicle5'\u001b[0m\n",
-      "        virtual int Nwheels() const = 0; // The only change from Vehicle4!\n",
-      "\u001b[0;1;32m                    ^\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
    "source": [
     "{   \n",
     "    Vehicle5 v; // Compilation error: you can't instantiate an abstract class!\n",
@@ -1508,18 +1301,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 67,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Nwheels = 2\n",
-      "Nwheels = 4\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "#include <iostream>\n",
     "{\n",
@@ -1553,7 +1337,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 68,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1576,7 +1360,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 69,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1588,7 +1372,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 70,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1600,28 +1384,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 71,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_85:4:38: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1mno member named 'GetOilType' in 'Vehicle5'\u001b[0m\n",
-      "    std::cout << \"Oil type = \" << c->GetOilType() << std::endl; // compilation error: been there before...\n",
-      "\u001b[0;1;32m                                  ~  ^\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "#include <iostream>\n",
     "\n",
@@ -1642,22 +1407,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 72,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "IncrementalExecutor::executeFunction: symbol '_ZTV11Car5WithOil' unresolved while linking [cling interface function]!\n",
-      "You are probably missing the definition of vtable for Car5WithOil\n",
-      "Maybe you need to load the corresponding shared library?\n",
-      "IncrementalExecutor::executeFunction: symbol '_ZTI11Car5WithOil' unresolved while linking [cling interface function]!\n",
-      "You are probably missing the definition of typeinfo for Car5WithOil\n",
-      "Maybe you need to load the corresponding shared library?\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "// Xeus-cling issue!\n",
     "\n",
@@ -1695,7 +1447,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 73,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1705,31 +1457,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 74,
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_90:1:27: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1mbase 'UnderivableClass' is marked 'final'\u001b[0m\n",
-      "class ITryAnyway : public UnderivableClass\n",
-      "\u001b[0;1;32m                          ^\n",
-      "\u001b[0m\u001b[1minput_line_89:2:8: \u001b[0m\u001b[0;1;30mnote: \u001b[0m'UnderivableClass' declared here\u001b[0m\n",
-      " class UnderivableClass final\n",
-      "\u001b[0;1;32m       ^                ~~~~~\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
    "source": [
     "class ITryAnyway : public UnderivableClass\n",
     "{ };"
@@ -1744,7 +1474,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 75,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1757,7 +1487,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 76,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1770,7 +1500,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 77,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1782,31 +1512,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 78,
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[1minput_line_94:3:18: \u001b[0m\u001b[0;1;31merror: \u001b[0m\u001b[1mdeclaration of 'Method1' overrides a 'final' function\u001b[0m\n",
-      "    virtual void Method1() override; // compilation error!\n",
-      "\u001b[0;1;32m                 ^\n",
-      "\u001b[0m\u001b[1minput_line_92:3:18: \u001b[0m\u001b[0;1;30mnote: \u001b[0moverridden virtual function is here\u001b[0m\n",
-      "    virtual void Method1() override final;\n",
-      "\u001b[0;1;32m                 ^\n",
-      "\u001b[0m"
-     ]
-    },
-    {
-     "ename": "Interpreter Error",
-     "evalue": "",
-     "output_type": "error",
-     "traceback": [
-      "Interpreter Error: "
-     ]
-    }
-   ],
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
    "source": [
     "struct DerivedClassSecondLevelIgnoreFinal : public DerivedClassFirstLevel\n",
     "{\n",
@@ -1825,7 +1533,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 79,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1839,7 +1547,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 80,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1854,7 +1562,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 81,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1866,7 +1574,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 82,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1880,7 +1588,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 83,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1892,7 +1600,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 84,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1904,26 +1612,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 85,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Here all should be well: \n",
-      "BaseClass3 constructor\n",
-      "DerivedClass3 constructor\n",
-      "DerivedClass3 destructor\n",
-      "BaseClass3 destructor\n",
-      "\n",
-      "But there not so much, see the missing destructor call! \n",
-      "BaseClass3 constructor\n",
-      "DerivedClass3 constructor\n",
-      "BaseClass3 destructor\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    std::cout << \"Here all should be well: \" << std::endl;\n",
@@ -1973,7 +1664,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 86,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1989,7 +1680,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 87,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -2003,7 +1694,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 88,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -2017,7 +1708,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 89,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -2029,7 +1720,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 90,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -2041,18 +1732,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 91,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Hello! I'm BaseClass4\n",
-      "Hello! I'm BaseClass4\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    DerivedClass4 object; // nope by stack allocation\n",
@@ -2072,7 +1754,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 92,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -2090,7 +1772,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 93,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -2104,7 +1786,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 94,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -2118,7 +1800,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 95,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -2130,7 +1812,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 96,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -2142,18 +1824,9 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 97,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Hello! I'm DerivedClass5\n",
-      "Hello! I'm DerivedClass5\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "{\n",
     "    DerivedClass5 object; // nope by stack allocation\n",