diff --git a/python_data_structure_exercises.ipynb b/python_data_structure_exercises.ipynb
index f1f93ab..ac01a0c 100644
--- a/python_data_structure_exercises.ipynb
+++ b/python_data_structure_exercises.ipynb
@@ -19,12 +19,28 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[50, 40, 30, 20, 10]"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "example_list = [10, 20, 30, 40, 50]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "reversed_list = []\n",
+    "for i in reversed(example_list):\n",
+    "   reversed_list.append(i)\n",
+    "   \n",
+    "reversed_list"
    ]
   },
   {
@@ -37,13 +53,27 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['A', 'D', 'B', 'E', 'C', 'F']\n"
+     ]
+    }
+   ],
    "source": [
     "list1 = [\"A\", \"B\", \"C\"]\n",
     "list2 = [\"D\", \"E\", \"F\"]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "new_list = []\n",
+    "for i in range(3):\n",
+    "    new_list.append(list1[i])\n",
+    "    new_list.append(list2[i])\n",
+    "\n",
+    "print(new_list)"
    ]
   },
   {
@@ -56,12 +86,25 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[1, 4, 9, 16, 25]\n"
+     ]
+    }
+   ],
    "source": [
     "numbers = [1, 2, 3, 4, 5]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "new_list = []\n",
+    "for i in numbers:\n",
+    "    new_list.append(i**2)\n",
+    "\n",
+    "print(new_list)"
    ]
   },
   {
@@ -74,13 +117,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 14,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['Hello ', 'World ', 'Python', 'Programming']\n"
+     ]
+    }
+   ],
    "source": [
     "list1 = [\"Hello \", \"World \"]\n",
     "list2 = [\"Python\", \"Programming\"]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "list3 = list1 + list2\n",
+    "\n",
+    "print(list3)"
    ]
   },
   {
@@ -93,13 +147,31 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 15,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "1\n",
+      "2\n",
+      "3\n",
+      "6\n",
+      "5\n",
+      "4\n"
+     ]
+    }
+   ],
    "source": [
     "list1 = [1, 2, 3]\n",
     "list2 = [4, 5, 6]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "for i in list1:\n",
+    "    print(i)\n",
+    "\n",
+    "for i in reversed(list2):\n",
+    "    print(i)"
    ]
   },
   {
@@ -112,12 +184,25 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 18,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['Alice', 'Bob', 'Charlie']\n"
+     ]
+    }
+   ],
    "source": [
     "string_list = [\"Alice\", \"\", \"Bob\", \"\", \"Charlie\"]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "for single_string in string_list:\n",
+    "    if single_string  == \"\":\n",
+    "        string_list.remove(\"\")\n",
+    "\n",
+    "print(string_list)"
    ]
   },
   {
@@ -130,12 +215,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 22,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[1000, 2000, [3000, 4000, [5000, 6000], 7000], 8000, 9000]\n"
+     ]
+    }
+   ],
    "source": [
     "nested_list = [1000, 2000, [3000, 4000, [5000, 6000], 7000], 8000]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "nested_list.append(9000)\n",
+    "print(nested_list)"
    ]
   },
   {
@@ -148,12 +243,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 24,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['p', 'q', ['r', ['s', 't'], 'u'], 'v', 'x', 'y', 'z']\n"
+     ]
+    }
+   ],
    "source": [
     "nested_list = [\"p\", \"q\", [\"r\", [\"s\", \"t\"], \"u\"], \"v\"]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "nested_list.append(\"x\")\n",
+    "nested_list.append(\"y\")\n",
+    "nested_list.append(\"z\")\n",
+    "print(nested_list)"
    ]
   },
   {
@@ -166,12 +273,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 27,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[5, 10, 150, 20, 15]\n"
+     ]
+    }
+   ],
    "source": [
     "list1 = [5, 10, 15, 20, 15]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "list1[2] = 150\n",
+    "print(list1)"
    ]
   },
   {
@@ -184,12 +301,25 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 32,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[5, 15, 35]\n"
+     ]
+    }
+   ],
    "source": [
     "list2 = [5, 25, 15, 25, 35]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "for i in list2:   \n",
+    "    if i == 25:\n",
+    "        list2.remove(25)\n",
+    "\n",
+    "print(list2)"
    ]
   },
   {
@@ -209,13 +339,23 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 34,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{'a': 1, 'b': 2, 'c': 3, 'd': 4}\n"
+     ]
+    }
+   ],
    "source": [
     "dict1 = {'a': 1, 'b': 2}\n",
     "dict2 = {'c': 3, 'd': 4}\n",
-    "# Your code here"
+    "# Your code here\n",
+    "dict3 = dict1 | dict2\n",
+    "print(dict3)"
    ]
   },
   {
@@ -228,12 +368,30 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 36,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{'h': 1, 'e': 1, 'l': 3, 'o': 2, ' ': 1, 'w': 1, 'r': 1, 'd': 1}\n"
+     ]
+    }
+   ],
    "source": [
     "input_string = \"hello world\"\n",
-    "# Your code here"
+    "# Your code here\n",
+    "letter_count = {}\n",
+    "for letter in input_string:\n",
+    "    if letter in letter_count:\n",
+    "        #known letter -> increase count by one\n",
+    "        letter_count[letter] +=1\n",
+    "    else:\n",
+    "        # new letter -> add to element_count\n",
+    "        letter_count[letter] = 1\n",
+    "\n",
+    "print(letter_count)"
    ]
   },
   {
@@ -246,12 +404,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 56,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['name', 'age']\n"
+     ]
+    }
+   ],
    "source": [
     "dict_1 = {'name': 'Alice', 'age': 25}\n",
-    "# Your code here"
+    "# Your code here\n",
+    "key_list = list(dict_1.keys())\n",
+    "print(key_list)\n"
    ]
   },
   {
@@ -264,12 +432,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 57,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{'name': 'John', 'age': 30}\n"
+     ]
+    }
+   ],
    "source": [
     "person_info = {'name': 'John', 'age': 25}\n",
-    "# Your code here"
+    "# Your code here\n",
+    "person_info[\"age\"] = 30\n",
+    "print(person_info)"
    ]
   },
   {
@@ -286,12 +464,26 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 61,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "TypeError",
+     "evalue": "dict.popitem() takes no arguments (1 given)",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[31m---------------------------------------------------------------------------\u001b[39m",
+      "\u001b[31mTypeError\u001b[39m                                 Traceback (most recent call last)",
+      "\u001b[36mCell\u001b[39m\u001b[36m \u001b[39m\u001b[32mIn[61]\u001b[39m\u001b[32m, line 3\u001b[39m\n\u001b[32m      1\u001b[39m location_info = {\u001b[33m'\u001b[39m\u001b[33mcountry\u001b[39m\u001b[33m'\u001b[39m: \u001b[33m'\u001b[39m\u001b[33mUSA\u001b[39m\u001b[33m'\u001b[39m, \u001b[33m'\u001b[39m\u001b[33mcity\u001b[39m\u001b[33m'\u001b[39m: \u001b[33m'\u001b[39m\u001b[33mNew York\u001b[39m\u001b[33m'\u001b[39m}\n\u001b[32m      2\u001b[39m \u001b[38;5;66;03m# Your code here\u001b[39;00m\n\u001b[32m----> \u001b[39m\u001b[32m3\u001b[39m \u001b[43mlocation_info\u001b[49m\u001b[43m.\u001b[49m\u001b[43mpopitem\u001b[49m\u001b[43m(\u001b[49m\u001b[33;43m\"\u001b[39;49m\u001b[33;43mcity\u001b[39;49m\u001b[33;43m\"\u001b[39;49m\u001b[43m)\u001b[49m\n\u001b[32m      4\u001b[39m \u001b[38;5;28mprint\u001b[39m(location_info)\n",
+      "\u001b[31mTypeError\u001b[39m: dict.popitem() takes no arguments (1 given)"
+     ]
+    }
+   ],
    "source": [
     "location_info = {'country': 'USA', 'city': 'New York'}\n",
-    "# Your code here"
+    "# Your code here\n",
+    "location_info.popitem(\"city\")\n",
+    "print(location_info)"
    ]
   },
   {
@@ -311,12 +503,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 63,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "(1, 2, 3)\n"
+     ]
+    }
+   ],
    "source": [
     "list3 = [1, 2, 3]\n",
-    "# Your code here"
+    "# Your code here\n",
+    "tuple1 = tuple(list3)\n",
+    "print(tuple1)"
    ]
   },
   {
@@ -329,12 +531,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 64,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "2"
+      ]
+     },
+     "execution_count": 64,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "tuple1 = (1, 2, 3, 2)\n",
-    "# Your code here"
+    "# Your code here\n",
+    "tuple1.count(2)"
    ]
   },
   {
@@ -347,12 +561,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 68,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "3"
+      ]
+     },
+     "execution_count": 68,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "tuple2 = (10, 20, 30, 5)\n",
-    "# Your code here"
+    "# Your code here\n",
+    "tuple2.index(5)"
    ]
   },
   {
@@ -365,12 +591,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 74,
    "metadata": {},
    "outputs": [],
    "source": [
     "tuple3 = (100, 'Hello', True)\n",
-    "# Your code here to unpack values into variables x, y and z."
+    "# Your code here to unpack values into variables x, y and z.\n",
+    "x = tuple3.index(100)\n",
+    "y = tuple3.index(\"Hello\")\n",
+    "z = tuple3.index(True)\n",
+    "\n"
    ]
   },
   {
@@ -383,11 +613,21 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 78,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "<class 'tuple'>\n"
+     ]
+    }
+   ],
    "source": [
-    "# Your code here to create a tuple with one element.\n"
+    "# Your code here to create a tuple with one element.\n",
+    "tuple1 = (42,)\n",
+    "print(type(tuple1))"
    ]
   },
   {
@@ -407,12 +647,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 80,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{1, 2, 3}\n"
+     ]
+    }
+   ],
    "source": [
     "list4 = [1, 2, 2, 3]\n",
-    "# Your code here to create a set."
+    "# Your code here to create a set.\n",
+    "set4 = set(list4)\n",
+    "print(set4)"
    ]
   },
   {
@@ -425,13 +675,23 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 82,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{1, 2, 3}\n"
+     ]
+    }
+   ],
    "source": [
     "set1 = {1, 2}\n",
     "set2 = {2, 3}\n",
-    "# Your code here to find union."
+    "# Your code here to find union.\n",
+    "set3 = set1.union(set2)\n",
+    "print(set3)"
    ]
   },
   {
@@ -444,13 +704,23 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 83,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{2}\n"
+     ]
+    }
+   ],
    "source": [
     "set1 = {1, 2}\n",
     "set2 = {2, 3}\n",
-    "# Your code here to find intersection."
+    "# Your code here to find intersection.\n",
+    "set3 = set1.intersection(set2)\n",
+    "print(set3)"
    ]
   },
   {
@@ -463,13 +733,23 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 85,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{1}\n"
+     ]
+    }
+   ],
    "source": [
     "set1 = {1, 2}\n",
     "set2 = {2, 3}\n",
-    "# Your code here to find difference."
+    "# Your code here to find difference.\n",
+    "set3 = set1 - set2\n",
+    "print(set3)"
    ]
   },
   {
@@ -482,13 +762,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 86,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "True\n"
+     ]
+    }
+   ],
    "source": [
     "set1 = {1}\n",
     "set2 = {1, 2}\n",
-    "# Your code here to check subset."
+    "# Your code here to check subset.\n",
+    "print(set1.issubset(set2))"
    ]
   },
   {
@@ -532,12 +821,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 87,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "10"
+      ]
+     },
+     "execution_count": 87,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "numbers_list = [10, -20, -30]\n",
-    "# Your code here to find maximum value.\n"
+    "# Your code here to find maximum value.\n",
+    "max(numbers_list)"
    ]
   },
   {
@@ -550,12 +851,29 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 11,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "radar is a palindrome: True\n"
+     ]
+    }
+   ],
    "source": [
     "input_string = \"radar\"\n",
-    "# Your code here to check for palindrome."
+    "# Your code here to check for palindrome.\n",
+    "is_palindrome = True\n",
+    "for i in range(len(input_string)):\n",
+    "    reversed_letter = list(reversed(input_string))[i]    \n",
+    "    letter = input_string[i]    \n",
+    "    if letter != reversed_letter:\n",
+    "        is_palindrome = False\n",
+    "       \n",
+    "\n",
+    "print(input_string + \" is a palindrome: \" + str(is_palindrome))"
    ]
   },
   {
@@ -568,12 +886,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 13,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[0, 1, 2, 3]\n"
+     ]
+    }
+   ],
    "source": [
     "numbers_list = [1, 2, 3]\n",
-    "# Your code here to rotate elements.\n"
+    "# Your code here to rotate elements.\n",
+    "numbers_list.insert(0,0)\n",
+    "print(numbers_list)"
    ]
   },
   {
@@ -586,12 +914,28 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 14,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "3\n"
+     ]
+    }
+   ],
    "source": [
     "input_string = \"Hello World\"\n",
-    "# Your code here to count vowels."
+    "# Your code here to count vowels.\n",
+    "vowels = ['a', 'e', 'i', 'o', 'u']\n",
+    "vowel_count = 0\n",
+    "\n",
+    "for letter in input_string:\n",
+    "    if letter in vowels:\n",
+    "        vowel_count  +=1\n",
+    "\n",
+    "print(vowel_count)"
    ]
   },
   {
@@ -604,13 +948,21 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": ".venv",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
   "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
    "name": "python",
-   "version": "3.8.0"
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.13.3"
   }
  },
  "nbformat": 4,