diff --git a/Book_1.ipynb b/Book_1.ipynb
index 27ea23c..d3d9e62 100644
--- a/Book_1.ipynb
+++ b/Book_1.ipynb
@@ -18,13 +18,15 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 240,
    "id": "1e6ac084-5bf9-43f7-a7a6-8c8e20066159",
    "metadata": {},
    "outputs": [],
    "source": [
     "import re \n",
-    "import numpy as np"
+    "import numpy as np\n",
+    "from functools import reduce\n",
+    "from math import factorial"
    ]
   },
   {
@@ -469,10 +471,60 @@
     "# just sum the total cards at the end\n",
     "print(sum(copies_of_card))\n",
     "        \n",
-    "        \n",
     "    \n",
     "    "
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "bdaf4568-5996-493b-9d9b-398b5e16f522",
+   "metadata": {},
+   "source": [
+    "# AANSCHOUW!!!!!\n",
+    "Het wonder, het fantastischste ding ooit, oneliners"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 302,
+   "id": "091f006e-838e-418b-8282-610cc6fadccc",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "21568"
+      ]
+     },
+     "execution_count": 302,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "reduce(lambda total, multipliers: (total + 2**(multipliers-1) if (multipliers > 0) else total) ,map(lambda numbers: len(numbers)-len(set(numbers)), [re.findall('(?:(\\d+)\\s|\\n)', line) for line in open('data/puzzle_4.txt')]), 0)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 400,
+   "id": "cdbdddfb-c0e4-4f9b-8b6c-4dd561c6236a",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "11827296"
+      ]
+     },
+     "execution_count": 400,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "sum([y for (x,y) in reduce(lambda total, cards: total + [(cards[0], 1)] + [(card, 1+sum([total_card[1] for total_card in total if total_card[0] == cards[0]])) for card in cards[1]], enumerate([j+1+i for j in range(len(re.findall(r'(?:\\b(\\d+)\\s)(?=.*\\s\\1\\b)', line)))] for i, line in enumerate(open('data/puzzle_4.txt'))), [])])"
+   ]
   }
  ],
  "metadata": {
diff --git a/pretty_read.md b/pretty_read.md
index 86519e6..2b5cb7d 100644
--- a/pretty_read.md
+++ b/pretty_read.md
@@ -6,6 +6,8 @@ Laten we beginnen met de imports
 ```python
 import re 
 import numpy as np
+from functools import reduce
+from math import factorial
 ```
 
 ## Puzzel 1
@@ -298,10 +300,36 @@ for i, card_id in enumerate(card_numbers):
 # just sum the total cards at the end
 print(sum(copies_of_card))
         
-        
     
     
 ```
 
     11827296
     
+
+# AANSCHOUW!!!!!
+Het wonder, het fantastischste ding ooit, oneliners
+
+
+```python
+reduce(lambda total, multipliers: (total + 2**(multipliers-1) if (multipliers > 0) else total) ,map(lambda numbers: len(numbers)-len(set(numbers)), [re.findall('(?:(\d+)\s|\n)', line) for line in open('data/puzzle_4.txt')]), 0)
+```
+
+
+
+
+    21568
+
+
+
+
+```python
+sum([y for (x,y) in reduce(lambda total, cards: total + [(cards[0], 1)] + [(card, 1+sum([total_card[1] for total_card in total if total_card[0] == cards[0]])) for card in cards[1]], enumerate([j+1+i for j in range(len(re.findall(r'(?:\b(\d+)\s)(?=.*\s\1\b)', line)))] for i, line in enumerate(open('data/puzzle_4.txt'))), [])])
+```
+
+
+
+
+    11827296
+
+