diff --git a/your-code/main.ipynb b/your-code/main.ipynb
index a9c7a0c..0fc3472 100644
--- a/your-code/main.ipynb
+++ b/your-code/main.ipynb
@@ -11,7 +11,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 24,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -30,7 +30,10 @@
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "new_list = [i for i in range(1,51)]\n",
+    "print(new_list)"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -44,7 +47,10 @@
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "new_list = [i for i in range(2,201,2)]\n",
+    "print(new_list)"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -55,7 +61,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -76,7 +82,15 @@
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "new_list = [for i in a for j in i]\n",
+    "\n",
+    "for i in a:\n",
+    "    for j in i:\n",
+    "        new_list.append(j)\n",
+    "        \n",
+    "print(new_list)"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -90,7 +104,11 @@
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "list_2 = [j for i in a for j in i if j >= 0.5]\n",
+    "        \n",
+    "print(list2)"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -101,7 +119,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 3,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -123,10 +141,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 7,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[0.55867166, 0.06210792, 0.08147297, 0.82579068, 0.91512478, 0.06833034, 0.05440634, 0.65857693, 0.30296619, 0.06769833, 0.96031863, 0.51293743, 0.09143215, 0.71893382, 0.45850679, 0.58256464, 0.59005654, 0.56266457, 0.71600294, 0.87392666, 0.11434044, 0.8694668, 0.65669313, 0.10708681, 0.07529684, 0.46470767, 0.47984544, 0.65368638, 0.14901286, 0.23760688]\n"
+     ]
+    }
+   ],
+   "source": [
+    "list0 = [list3 for list1 in b for list2 in list1 for list3 in list2]\n",
+    "\n",
+    "print(list0)"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -137,10 +167,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 19,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[0.08147297, 0.06833034, 0.30296619, 0.45850679, 0.11434044, 0.10708681, 0.47984544, 0.23760688]\n"
+     ]
+    }
+   ],
+   "source": [
+    "list_1 = [subarray[-1] for array in b for subarray in array if subarray[-1] <= 0.5]\n",
+    "\n",
+    "print(list_1)\n"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -151,10 +193,28 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 51,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "CSV files in the directory:\n",
+      "['sample_file_0.csv', 'sample_file_1.csv', 'sample_file_2.csv', 'sample_file_3.csv', 'sample_file_4.csv', 'sample_file_5.csv', 'sample_file_6.csv', 'sample_file_7.csv', 'sample_file_8.csv', 'sample_file_9.csv']\n"
+     ]
+    }
+   ],
+   "source": [
+    "import os\n",
+    "\n",
+    "directory_path = 'C://Users//Felix//Documents//Ironhack//lab-list-comprehension//data'\n",
+    "\n",
+    "csv_files = [file for file in os.listdir(directory_path) if file.endswith('.csv')]\n",
+    "\n",
+    "print(\"CSV files in the directory:\")\n",
+    "print(csv_files)\n"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -189,11 +249,79 @@
     "**Advanced**\n",
     "- [Queue time counter](https://www.codewars.com/kata/queue-time-counter)"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 53,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[-1, -2, -3, 4, 5]\n"
+     ]
+    }
+   ],
+   "source": [
+    "list_=[1,2,3,-4,-5]\n",
+    "\n",
+    "inverted_number = [-num for num in list_]\n",
+    "\n",
+    "print(inverted_number)\n",
+    "            "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 88,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "9\n"
+     ]
+    }
+   ],
+   "source": [
+    "sum_1 = [1, 2 ,2]\n",
+    "\n",
+    "result = sum(a ** 2 for a in sum_1)\n",
+    "\n",
+    "print(result)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 100,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['5', '4', '3', '2', '2', '4', '3', '6']\n"
+     ]
+    }
+   ],
+   "source": [
+    "return_array = 54322436\n",
+    "\n",
+    "new_array = []\n",
+    "\n",
+    "for num in str(return_array):\n",
+    "        new_array.append(num)\n",
+    "    \n",
+    "print(new_array)\n",
+    "    \n"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -207,7 +335,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.2"
+   "version": "3.11.3"
   }
  },
  "nbformat": 4,