diff --git a/data/sample_file_3.csv b/data/sample_file_3.csv
index b6dc8f8..b937aa6 100644
--- a/data/sample_file_3.csv
+++ b/data/sample_file_3.csv
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diff --git a/data/sample_file_3.txt b/data/sample_file_3.txt
index b6dc8f8..b937aa6 100644
--- a/data/sample_file_3.txt
+++ b/data/sample_file_3.txt
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diff --git a/data/sample_file_4.csv b/data/sample_file_4.csv
index 1742f9f..4ed28a7 100644
--- a/data/sample_file_4.csv
+++ b/data/sample_file_4.csv
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diff --git a/data/sample_file_4.txt b/data/sample_file_4.txt
index 1742f9f..4ed28a7 100644
--- a/data/sample_file_4.txt
+++ b/data/sample_file_4.txt
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diff --git a/data/sample_file_5.csv b/data/sample_file_5.csv
index a0954cb..e9f1a54 100644
--- a/data/sample_file_5.csv
+++ b/data/sample_file_5.csv
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diff --git a/data/sample_file_5.txt b/data/sample_file_5.txt
index a0954cb..e9f1a54 100644
--- a/data/sample_file_5.txt
+++ b/data/sample_file_5.txt
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diff --git a/data/sample_file_6.csv b/data/sample_file_6.csv
index 66f1e13..c603680 100644
--- a/data/sample_file_6.csv
+++ b/data/sample_file_6.csv
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diff --git a/data/sample_file_6.txt b/data/sample_file_6.txt
index 66f1e13..c603680 100644
--- a/data/sample_file_6.txt
+++ b/data/sample_file_6.txt
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diff --git a/data/sample_file_7.csv b/data/sample_file_7.csv
index f337d3b..b10ace2 100644
--- a/data/sample_file_7.csv
+++ b/data/sample_file_7.csv
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diff --git a/data/sample_file_7.txt b/data/sample_file_7.txt
index f337d3b..b10ace2 100644
--- a/data/sample_file_7.txt
+++ b/data/sample_file_7.txt
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diff --git a/data/sample_file_8.csv b/data/sample_file_8.csv
index 7777b5e..1ecad1f 100644
--- a/data/sample_file_8.csv
+++ b/data/sample_file_8.csv
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diff --git a/data/sample_file_8.txt b/data/sample_file_8.txt
index 7777b5e..1ecad1f 100644
--- a/data/sample_file_8.txt
+++ b/data/sample_file_8.txt
@@ -1,6 +1,6 @@
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diff --git a/data/sample_file_9.csv b/data/sample_file_9.csv
index 26187e2..2ba0cd1 100644
--- a/data/sample_file_9.csv
+++ b/data/sample_file_9.csv
@@ -1,6 +1,6 @@
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diff --git a/data/sample_file_9.txt b/data/sample_file_9.txt
index 26187e2..2ba0cd1 100644
--- a/data/sample_file_9.txt
+++ b/data/sample_file_9.txt
@@ -1,6 +1,6 @@
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diff --git a/your-code/main.ipynb b/your-code/main.ipynb
index a9c7a0c..08b1ffd 100644
--- a/your-code/main.ipynb
+++ b/your-code/main.ipynb
@@ -11,7 +11,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 40,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -27,10 +27,73 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 41,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[1,\n",
+       " 2,\n",
+       " 3,\n",
+       " 4,\n",
+       " 5,\n",
+       " 6,\n",
+       " 7,\n",
+       " 8,\n",
+       " 9,\n",
+       " 10,\n",
+       " 11,\n",
+       " 12,\n",
+       " 13,\n",
+       " 14,\n",
+       " 15,\n",
+       " 16,\n",
+       " 17,\n",
+       " 18,\n",
+       " 19,\n",
+       " 20,\n",
+       " 21,\n",
+       " 22,\n",
+       " 23,\n",
+       " 24,\n",
+       " 25,\n",
+       " 26,\n",
+       " 27,\n",
+       " 28,\n",
+       " 29,\n",
+       " 30,\n",
+       " 31,\n",
+       " 32,\n",
+       " 33,\n",
+       " 34,\n",
+       " 35,\n",
+       " 36,\n",
+       " 37,\n",
+       " 38,\n",
+       " 39,\n",
+       " 40,\n",
+       " 41,\n",
+       " 42,\n",
+       " 43,\n",
+       " 44,\n",
+       " 45,\n",
+       " 46,\n",
+       " 47,\n",
+       " 48,\n",
+       " 49,\n",
+       " 50]"
+      ]
+     },
+     "execution_count": 41,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "x = [i for i in range(1,51)]\n",
+    "x"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -41,10 +104,122 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 42,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[2,\n",
+       " 4,\n",
+       " 6,\n",
+       " 8,\n",
+       " 10,\n",
+       " 12,\n",
+       " 14,\n",
+       " 16,\n",
+       " 18,\n",
+       " 20,\n",
+       " 22,\n",
+       " 24,\n",
+       " 26,\n",
+       " 28,\n",
+       " 30,\n",
+       " 32,\n",
+       " 34,\n",
+       " 36,\n",
+       " 38,\n",
+       " 40,\n",
+       " 42,\n",
+       " 44,\n",
+       " 46,\n",
+       " 48,\n",
+       " 50,\n",
+       " 52,\n",
+       " 54,\n",
+       " 56,\n",
+       " 58,\n",
+       " 60,\n",
+       " 62,\n",
+       " 64,\n",
+       " 66,\n",
+       " 68,\n",
+       " 70,\n",
+       " 72,\n",
+       " 74,\n",
+       " 76,\n",
+       " 78,\n",
+       " 80,\n",
+       " 82,\n",
+       " 84,\n",
+       " 86,\n",
+       " 88,\n",
+       " 90,\n",
+       " 92,\n",
+       " 94,\n",
+       " 96,\n",
+       " 98,\n",
+       " 100,\n",
+       " 102,\n",
+       " 104,\n",
+       " 106,\n",
+       " 108,\n",
+       " 110,\n",
+       " 112,\n",
+       " 114,\n",
+       " 116,\n",
+       " 118,\n",
+       " 120,\n",
+       " 122,\n",
+       " 124,\n",
+       " 126,\n",
+       " 128,\n",
+       " 130,\n",
+       " 132,\n",
+       " 134,\n",
+       " 136,\n",
+       " 138,\n",
+       " 140,\n",
+       " 142,\n",
+       " 144,\n",
+       " 146,\n",
+       " 148,\n",
+       " 150,\n",
+       " 152,\n",
+       " 154,\n",
+       " 156,\n",
+       " 158,\n",
+       " 160,\n",
+       " 162,\n",
+       " 164,\n",
+       " 166,\n",
+       " 168,\n",
+       " 170,\n",
+       " 172,\n",
+       " 174,\n",
+       " 176,\n",
+       " 178,\n",
+       " 180,\n",
+       " 182,\n",
+       " 184,\n",
+       " 186,\n",
+       " 188,\n",
+       " 190,\n",
+       " 192,\n",
+       " 194,\n",
+       " 196,\n",
+       " 198,\n",
+       " 200]"
+      ]
+     },
+     "execution_count": 42,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "[i for i in range(2,201) if i %2 == 0  ]"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -55,7 +230,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 43,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -73,10 +248,62 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 44,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[0.84062117,\n",
+       " 0.48006452,\n",
+       " 0.7876326,\n",
+       " 0.77109654,\n",
+       " 0.44409793,\n",
+       " 0.09014516,\n",
+       " 0.81835917,\n",
+       " 0.87645456,\n",
+       " 0.7066597,\n",
+       " 0.09610873,\n",
+       " 0.41247947,\n",
+       " 0.57433389,\n",
+       " 0.29960807,\n",
+       " 0.42315023,\n",
+       " 0.34452557,\n",
+       " 0.4751035,\n",
+       " 0.17003563,\n",
+       " 0.46843998,\n",
+       " 0.92796258,\n",
+       " 0.69814654,\n",
+       " 0.41290051,\n",
+       " 0.19561071,\n",
+       " 0.16284783,\n",
+       " 0.97016248,\n",
+       " 0.71725408,\n",
+       " 0.87702738,\n",
+       " 0.31244595,\n",
+       " 0.76615487,\n",
+       " 0.20754036,\n",
+       " 0.57871812,\n",
+       " 0.07214068,\n",
+       " 0.40356048,\n",
+       " 0.12149553,\n",
+       " 0.53222417,\n",
+       " 0.9976855,\n",
+       " 0.12536346,\n",
+       " 0.80930099,\n",
+       " 0.50962849,\n",
+       " 0.94555126,\n",
+       " 0.33364763]"
+      ]
+     },
+     "execution_count": 44,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "[j for i in a for j in i]"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -87,10 +314,41 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 45,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[0.84062117,\n",
+       " 0.7876326,\n",
+       " 0.77109654,\n",
+       " 0.81835917,\n",
+       " 0.87645456,\n",
+       " 0.7066597,\n",
+       " 0.57433389,\n",
+       " 0.92796258,\n",
+       " 0.69814654,\n",
+       " 0.97016248,\n",
+       " 0.71725408,\n",
+       " 0.87702738,\n",
+       " 0.76615487,\n",
+       " 0.57871812,\n",
+       " 0.53222417,\n",
+       " 0.9976855,\n",
+       " 0.80930099,\n",
+       " 0.50962849,\n",
+       " 0.94555126]"
+      ]
+     },
+     "execution_count": 45,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "[j for i in a for j in i if j >=0.5]"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -101,7 +359,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 46,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -123,10 +381,52 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 47,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[0.55867166,\n",
+       " 0.06210792,\n",
+       " 0.08147297,\n",
+       " 0.82579068,\n",
+       " 0.91512478,\n",
+       " 0.06833034,\n",
+       " 0.05440634,\n",
+       " 0.65857693,\n",
+       " 0.30296619,\n",
+       " 0.06769833,\n",
+       " 0.96031863,\n",
+       " 0.51293743,\n",
+       " 0.09143215,\n",
+       " 0.71893382,\n",
+       " 0.45850679,\n",
+       " 0.58256464,\n",
+       " 0.59005654,\n",
+       " 0.56266457,\n",
+       " 0.71600294,\n",
+       " 0.87392666,\n",
+       " 0.11434044,\n",
+       " 0.8694668,\n",
+       " 0.65669313,\n",
+       " 0.10708681,\n",
+       " 0.07529684,\n",
+       " 0.46470767,\n",
+       " 0.47984544,\n",
+       " 0.65368638,\n",
+       " 0.14901286,\n",
+       " 0.23760688]"
+      ]
+     },
+     "execution_count": 47,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "[x for i in b for j in i for x in j]"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -137,10 +437,45 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 52,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[0.08147297,\n",
+       " 0.06833034,\n",
+       " 0.30296619,\n",
+       " 0.45850679,\n",
+       " 0.11434044,\n",
+       " 0.10708681,\n",
+       " 0.47984544,\n",
+       " 0.23760688]"
+      ]
+     },
+     "execution_count": 52,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "b = [[[0.55867166, 0.06210792, 0.08147297],\n",
+    "        [0.82579068, 0.91512478, 0.06833034]],\n",
+    "\n",
+    "       [[0.05440634, 0.65857693, 0.30296619],\n",
+    "        [0.06769833, 0.96031863, 0.51293743]],\n",
+    "\n",
+    "       [[0.09143215, 0.71893382, 0.45850679],\n",
+    "        [0.58256464, 0.59005654, 0.56266457]],\n",
+    "\n",
+    "       [[0.71600294, 0.87392666, 0.11434044],\n",
+    "        [0.8694668 , 0.65669313, 0.10708681]],\n",
+    "\n",
+    "       [[0.07529684, 0.46470767, 0.47984544],\n",
+    "        [0.65368638, 0.14901286, 0.23760688]]];\n",
+    "\n",
+    "[j[-1] for i in b for j in i if j if j[-1] <= 0.5]"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -151,10 +486,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 69,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['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",
+    "path = \"C://Users/amirg/OneDrive/Documents/Iron hack/1_Data Analysis_Oktober/Week 1/Labs/4_lab-list-comprehension/data\"\n",
+    "dir_list = os.listdir(path)\n",
+    "files = [i for i in dir_list if i[-3:] == \"csv\"]\n",
+    "print(files)"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -170,6 +519,19 @@
     "Try to solve these katas using list comprehensions."
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Given a set of numbers, return the additive inverse of each. Each positive becomes negatives, and the negatives become positives.\n",
+    "invert([1,2,3,4,5]) == [-1,-2,-3,-4,-5]\n",
+    "invert([1,-2,3,-4,5]) == [-1,2,-3,4,-5]\n",
+    "invert([]) == []\n",
+    "\n",
+    "You can assume that all values are integers. Do not mutate the input array/list.\n",
+    "\n"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},