diff --git a/ml2/3_5_Exercise_1.ipynb b/ml2/3_5_Exercise_1.ipynb
index c59fba3..80dcc56 100644
--- a/ml2/3_5_Exercise_1.ipynb
+++ b/ml2/3_5_Exercise_1.ipynb
@@ -81,147 +81,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "metadata": {
     "collapsed": false
    },
-   "outputs": [
-    {
-     "data": {
-      "text/html": [
-       "<div>\n",
-       "<table border=\"1\" class=\"dataframe\">\n",
-       "  <thead>\n",
-       "    <tr style=\"text-align: right;\">\n",
-       "      <th></th>\n",
-       "      <th>PassengerId</th>\n",
-       "      <th>Survived</th>\n",
-       "      <th>Pclass</th>\n",
-       "      <th>Name</th>\n",
-       "      <th>Sex</th>\n",
-       "      <th>Age</th>\n",
-       "      <th>SibSp</th>\n",
-       "      <th>Parch</th>\n",
-       "      <th>Ticket</th>\n",
-       "      <th>Fare</th>\n",
-       "      <th>Cabin</th>\n",
-       "      <th>Embarked</th>\n",
-       "    </tr>\n",
-       "  </thead>\n",
-       "  <tbody>\n",
-       "    <tr>\n",
-       "      <th>0</th>\n",
-       "      <td>1</td>\n",
-       "      <td>0</td>\n",
-       "      <td>3</td>\n",
-       "      <td>Braund, Mr. Owen Harris</td>\n",
-       "      <td>male</td>\n",
-       "      <td>22.0</td>\n",
-       "      <td>1</td>\n",
-       "      <td>0</td>\n",
-       "      <td>A/5 21171</td>\n",
-       "      <td>7.2500</td>\n",
-       "      <td>NaN</td>\n",
-       "      <td>S</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>1</th>\n",
-       "      <td>2</td>\n",
-       "      <td>1</td>\n",
-       "      <td>1</td>\n",
-       "      <td>Cumings, Mrs. John Bradley (Florence Briggs Th...</td>\n",
-       "      <td>female</td>\n",
-       "      <td>38.0</td>\n",
-       "      <td>1</td>\n",
-       "      <td>0</td>\n",
-       "      <td>PC 17599</td>\n",
-       "      <td>71.2833</td>\n",
-       "      <td>C85</td>\n",
-       "      <td>C</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>2</th>\n",
-       "      <td>3</td>\n",
-       "      <td>1</td>\n",
-       "      <td>3</td>\n",
-       "      <td>Heikkinen, Miss. Laina</td>\n",
-       "      <td>female</td>\n",
-       "      <td>26.0</td>\n",
-       "      <td>0</td>\n",
-       "      <td>0</td>\n",
-       "      <td>STON/O2. 3101282</td>\n",
-       "      <td>7.9250</td>\n",
-       "      <td>NaN</td>\n",
-       "      <td>S</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>3</th>\n",
-       "      <td>4</td>\n",
-       "      <td>1</td>\n",
-       "      <td>1</td>\n",
-       "      <td>Futrelle, Mrs. Jacques Heath (Lily May Peel)</td>\n",
-       "      <td>female</td>\n",
-       "      <td>35.0</td>\n",
-       "      <td>1</td>\n",
-       "      <td>0</td>\n",
-       "      <td>113803</td>\n",
-       "      <td>53.1000</td>\n",
-       "      <td>C123</td>\n",
-       "      <td>S</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>4</th>\n",
-       "      <td>5</td>\n",
-       "      <td>0</td>\n",
-       "      <td>3</td>\n",
-       "      <td>Allen, Mr. William Henry</td>\n",
-       "      <td>male</td>\n",
-       "      <td>35.0</td>\n",
-       "      <td>0</td>\n",
-       "      <td>0</td>\n",
-       "      <td>373450</td>\n",
-       "      <td>8.0500</td>\n",
-       "      <td>NaN</td>\n",
-       "      <td>S</td>\n",
-       "    </tr>\n",
-       "  </tbody>\n",
-       "</table>\n",
-       "</div>"
-      ],
-      "text/plain": [
-       "   PassengerId  Survived  Pclass  \\\n",
-       "0            1         0       3   \n",
-       "1            2         1       1   \n",
-       "2            3         1       3   \n",
-       "3            4         1       1   \n",
-       "4            5         0       3   \n",
-       "\n",
-       "                                                Name     Sex   Age  SibSp  \\\n",
-       "0                            Braund, Mr. Owen Harris    male  22.0      1   \n",
-       "1  Cumings, Mrs. John Bradley (Florence Briggs Th...  female  38.0      1   \n",
-       "2                             Heikkinen, Miss. Laina  female  26.0      0   \n",
-       "3       Futrelle, Mrs. Jacques Heath (Lily May Peel)  female  35.0      1   \n",
-       "4                           Allen, Mr. William Henry    male  35.0      0   \n",
-       "\n",
-       "   Parch            Ticket     Fare Cabin Embarked  \n",
-       "0      0         A/5 21171   7.2500   NaN        S  \n",
-       "1      0          PC 17599  71.2833   C85        C  \n",
-       "2      0  STON/O2. 3101282   7.9250   NaN        S  \n",
-       "3      0            113803  53.1000  C123        S  \n",
-       "4      0            373450   8.0500   NaN        S  "
-      ]
-     },
-     "execution_count": 3,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "url=\"https://raw.githubusercontent.com/gsi-upm/sitc/master/ml2/data-titanic/train.csv\"\n",
-    "df = pd.read_csv(url)\n",
-    "df_original = df.copy() # Copy to have a version of df without modifications\n",
-    "df.head()"
-   ]
+   "outputs": [],
+   "source": []
   },
   {
    "cell_type": "markdown",
@@ -572,83 +437,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 8,
    "metadata": {
     "collapsed": false
    },
-   "outputs": [
-    {
-     "data": {
-      "text/plain": [
-       "0      X\n",
-       "1      A\n",
-       "2      X\n",
-       "3      A\n",
-       "4      X\n",
-       "5      X\n",
-       "6      A\n",
-       "7      X\n",
-       "8      X\n",
-       "9      X\n",
-       "10     A\n",
-       "11     A\n",
-       "12     X\n",
-       "13     X\n",
-       "14     X\n",
-       "15     X\n",
-       "16     X\n",
-       "17     X\n",
-       "18     X\n",
-       "19     X\n",
-       "20     X\n",
-       "21     A\n",
-       "22     X\n",
-       "23     A\n",
-       "24     X\n",
-       "25     X\n",
-       "26     X\n",
-       "27     A\n",
-       "28     X\n",
-       "29     X\n",
-       "      ..\n",
-       "861    X\n",
-       "862    A\n",
-       "863    X\n",
-       "864    X\n",
-       "865    X\n",
-       "866    X\n",
-       "867    A\n",
-       "868    X\n",
-       "869    X\n",
-       "870    X\n",
-       "871    A\n",
-       "872    A\n",
-       "873    X\n",
-       "874    X\n",
-       "875    X\n",
-       "876    X\n",
-       "877    X\n",
-       "878    X\n",
-       "879    A\n",
-       "880    X\n",
-       "881    X\n",
-       "882    X\n",
-       "883    X\n",
-       "884    X\n",
-       "885    X\n",
-       "886    X\n",
-       "887    A\n",
-       "888    X\n",
-       "889    A\n",
-       "890    X\n",
-       "Name: Deck, dtype: object"
-      ]
-     },
-     "execution_count": 7,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
+   "outputs": [],
    "source": [
     "def substrings_in_string(big_string, substrings):\n",
     "    if type(big_string) == float:\n",
@@ -662,8 +455,7 @@
     " \n",
     "#Turning cabin number into Deck\n",
     "cabin_list = ['A', 'B', 'C', 'D', 'E', 'F', 'T', 'G', 'Unknown']\n",
-    "df['Deck']=df['Cabin'].map(lambda x: substrings_in_string(x, cabin_list))\n",
-    "df['Deck']\n"
+    "df['Deck']=df['Cabin'].map(lambda x: substrings_in_string(x, cabin_list))"
    ]
   },
   {