diff --git a/day06/default.nix b/day06/default.nix
new file mode 100644
index 0000000..dbceed9
--- /dev/null
+++ b/day06/default.nix
@@ -0,0 +1,80 @@
+{ pkgs, lib }:
+
+with lib;
+
+let
+
+  input = stringToCharacters (fileContents ./input.txt);
+
+  foldl'' = f: l: let
+    initial = take 2 l;
+  in foldl f (f (elemAt initial 0) (elemAt initial 1)) (drop 2 l);
+
+  countUntil = pred: l: let
+    innerCount = list: count:
+      if pred (head list)
+        then count
+        else innerCount (drop 1 list) (count + 1);
+  in innerCount l 0;
+
+  zip4ListsWith = f: fst: snd: trd: fth:
+    genList
+    (n: f (elemAt fst n) (elemAt snd n) (elemAt trd n) (elemAt fth n))
+    (pipe [fst snd trd fth] [
+      (map length)
+      (foldl'' min)
+    ]);
+
+  zip4Lists = fst: snd: trd: fth:
+    zip4ListsWith (fst: snd: trd: fth: { inherit fst snd trd fth; }) fst snd trd fth;
+
+  all4ItemsAreUnique = { fst, snd, trd, fth }: fst != snd
+                                            && fst != trd
+                                            && fst != fth
+                                            && snd != trd
+                                            && snd != fth
+                                            && trd != fth;
+
+  answer1 = pipe input [
+    (l: zip4Lists l (drop 1 l) (drop 2 l) (drop 3 l))
+    (countUntil all4ItemsAreUnique)
+    (add 4)
+    toString
+  ];
+
+  zipLists = lists: let 
+    minLength = (pipe lists [
+      (map length)
+      (foldl'' min)
+    ]);
+  in genList
+  (n: pipe lists [
+    (map (flip elemAt n))
+    (imap0 (i: nameValuePair (toString i)))
+    listToAttrs
+  ]) minLength;
+
+  zipNSelfWithOffset = n: offset: l: 
+    zipLists (map (i: drop (offset * i) l) (range 0 (n - 1)));
+
+  allItemsAreUnique = l:
+    if l == []
+      then true
+      else !(elem (head l) (drop 1 l))
+        && allItemsAreUnique (drop 1 l);
+
+  answer2 = pipe input [
+    (zipNSelfWithOffset 14 1)
+    (map attrValues)
+    (countUntil allItemsAreUnique)
+    (add 14)
+    toString
+  ];
+
+in pkgs.writeText "answers" ''
+  Task1:
+    ${answer1}
+
+  Task2:
+    ${answer2}
+''
diff --git a/day06/input.txt b/day06/input.txt
new file mode 100644
index 0000000..49640c2
--- /dev/null
+++ b/day06/input.txt
@@ -0,0 +1 @@
+pqffvllhrhthvhshhpnhpnpqpvpvrpvpwvwjjdssmcsmccjvjmjjwnjwjwhjwwwzswwhvhwwlvvlbvbtbzbfbzbtbqbgbpbggwzggvjjdpdffbmffntncchtccbcffcjfjnjfnntssvtstzssmnnhrhlhbbwfwjfwjfwwbhhfhmmpsssbnssssfzzfpffdrdpdqqvnncjjgrjjmhhpqqcjqcjjzdzzpvvprrlglrrcmcqqtltdltddswsrrzzwgzzgssczcmzzmgmwgmggwwzttpccmcsmmvfvnvppzlzvzllgclggpfggfnfrfvrvwwvhwwvgwwrbbgfglflblzblzbznzhzffplffnrrcqqsgsvshvhlldhhvnhhmdddnssdvdwdwccggmddsmswwtctdtqqjsshhjzzdpdmpdmppjtjwjswjsjjjsdjjtrtbrbjjwwvnvppqphqhwhcwhwbbpgbbnhbnhhswwdswwlcczdztzbbbnwwtmmpvvgjjqgqdqzzdjdpjjnnffhccscvvchhbmbcbffpdpggvdvttpvpqqhggdtdhtdhhmghmgggzwgwrgwggwlggvpggcfcttzmtmgmvgmmpqmqlmqllsqqjbjwjsszczlzrzgrzzhshlhjjwttwnntbtjtjpplccqrqhrhssbmbttrddfvfwwjcwcvwcwwvpvggqwgwjgwgccvqqcmqqtqnqpnqnffdqfqhhqnhnmhmvhmhwwfrwrggnmmmcnmmgsszmzlmzmddcwwthtssgjsgjjgpgnppdqqcgqggzjgjngnrnggvffgddvtvctcftcftfnnnnhssbgsgwwthtqtltftqtnqttsrtrggwcgwcwmwgmgvmmzrmzrzjzmmcclmmtjmjhmmlhlwlppnpccbbrlrqrcrjrdrlrnngmnmvmcmzczztbblglccvzvppzspsddrzzlsllfzfsspnpdnpnvvvgmmpccmpcpgcpcwcddtmddgwgngqqcpqqlhqqczqqbvqqgdqgqmgmlmmvrrgfgzffbccldcdmmcmcgcngnghngngdngdndcncbbpqbbphbphpccpcwwjswwfttbqbsszccrbbdndsdrdqrqjrjjbmbtbdbbgbvgvcggwdwcccttqccnffjpjqqzpzlzvlljhhschhzlhhfhcfhchvcvtvtgvgzvzrvrdrgrwrjwjljhljlssszsqzsswhhmlhlrhlhzzgghjhzjjcllwrwtrrbdbrbnrnprnrffjvvphhvbbqbbscstsmslmlvmvrmmvvngnlnzzwqzzjqqsqbqrrtmrtmmfgmgrgjjtmjmrrddmrrqmrrjmjqmqnqmmcmlmfmffcgcclplffzvzwvzzjtztftqftqffjjpwjjbpjjggzdgzgwzzfrfvvhfvvwcvvbccfcvffpcpgpbbqhbbhmmzfmfvvnjvnjjhzhqqmffndndmmzhmmqnnlglvvjhjddvggqwgwdgwdggqbqgqrqlrrtptsswlssqwssbdsdrsddjsszjszjjpnjnvnjvnnmznmnddccpwwhshzzcfcqcwcddsjjmnjmjljwwgmglllqlhhctcvvqrvrrhfrrbcrrfbrfbrfrqffbwbqwbbjggsjjjnqqrqsqhhwnhnshnhhdjjqfqpqmmqgqgqggzmmnncrrpgglgqlqclqlsqqwnnfntnzttrnnmtmvvfppbrprzpzzdzvvtctnncpclpccsbbswwcscjssvhvhhqggzmgmqgmgwwgcwgccrllzhzzlzlbljbllmqqpjqqhrhqhjhbbjmjmhmddmwmcmvvmbbmvbmmznnwvwlwtllhwlwgwpgplgpgmgngjgglbglgmllvvlttgrrrlsrllghlggjdjwwfjwfjfvhjmgqnwhwpbdtzrphsqbmmvscslhbdzffsfshgsdjbqbwlgmrtschcnfhdlnndsvpwmwttfglpghhznmgfcjsdlwhnmfqvmpvhgpnnwtjfztbmtprqhsqtjwzhwcqjtjbtqwlcldnvggrwddmpllwnrqwdljwzfzqwcdwgqwvnthnrpcsfwrmqvbzjvzqnmdnfgtbzgtnrvblfwmhdsddgbffnjzvjzfpwglctpqhnqdvtblcchrlmndzhlsczgnsmnbwgnjngnjtlrdpfhqjrwcrqvcpspbtwcvgvvmpnwqjjpdpnslmcrcjnjmhqmrmfbcmrcmpbcbhpcvwqwflljfpgdvqhgdwgcphjqfnqzjjpsqnbtfzhftjtfcbhhcmmlwcfznsflfpphprrgvqwfgjcwfgjfsghzcbqrldwrjlzlbjhpgrbmgdpgzmfsqsphqbbslwwpzspccrhcfrgcjlfwhlcmzdcltbbpcrzglqgqntpwtmgstqlmcsqqbsqgmsmfznwcrfdgvsmnfqmwtsvqvlhwwjlrlhnsvcnrtwwmrjcgfncvlrcqrllndlvmrjpfjpgrrjcwhsqvlbtnlqgwjjqzwcvtvlnfnmqqshbcnqtcbvnwtwbfdgqmvnpmjhlsfdntfwwntvsrrsmspzqmglfnprjtdbmbgnplzzclsjpnzwdhcbhpfnqrgmgqtpfhgnfbqhrpmznbrshjhntzctslwhtgtjvpqhntmchhtncfjmbzcgnpcbpmldrtnpvrzqfftbjjcjlpwwgvmnstjghftcczjzfsftgzpfhbspqmrbfhcdfmqbrgrbsmjvgpbrnvbblwwvqzzpmqrspzvzppjfbgfftdvsdvmrjzhfslptzmgndnqqgmrrfnbbpvbmvpngwjhzvfbwfnzlrgwffvjsfdldfgchfjmnzfnzhwrwttrzlrhmnwvjjdqfmbpfllhrgmddjgnwjnbqwjnslcrdjrmnldcpsgzjpdhrpdfwhbvwhwnhcsmwcwstvqrcrqsnvjrzljfgbljfszchbsqnldgntvcscwqqmpnlwtlfmswtmvrlpzgbrjhtgjgpnhggnprpvwfqpjffqhtfvpnrptgrtwzzlvplgnfjmqphgmnssccrdndqgpljtwtntshrpgsjcdrpmccjnjdgmpmzbfhqjzphcswtwvvqcrwsjhtdqgrhqjmjjcrblpswcblnpzvfztqtbpgjcgngqmwrjtlmhvlsbmrdzwlgqlfqcqnsnjcnddssqbftjvnlgcwwfcgdpdmqrdsjmcnzrfrpnvjmbsltpzwjhjzqqvbgrltczbgvcpwdzqsvhddsbjgjgcmnldrfhnhddlvjcvsnghprjwlghhtghldcqsdcdgnmbcjglvjjvvlbhzczlmjsdqtdpzdtvfztgsdfjsdtfchvzcgvhjnnncmsrfvvmcsjjdftmlpczgvtwngssqmzlmsrrsrbhhhrnwqhmpcdvqmdsvvtsgsqfdcpgsdgzvmbzpbpgtcbshnvdzlmpnwmqrvnmrjprmvppjwfbjhlhzsfhqqzmpbclqvsvfrcqwprrcvqcbbwvnqfwnrgjhlwmgzpfspqrvqrhmqnwvzjrhvvgdgswlvzjjhjtdctlthlpzqhjvwwbpsclpgflcnsdshrqbhmczcwljqlndfnfrcdgmptpsltrcjccnpdchgnswdcpsslcslcjznzpgfhznhbgqhdqvddmqzdnmpshhdcjrsmfjllhfvjvmzzhzrvlbpzqngwmlwcmqnppqzncvjshfrpjlptvnqfrfcrfnbhwhpdqqvjhsqvsmprtgfrddwzjzlwhhqvjpfrwgwvwpszzsfzwjtwngdjfllhjrmqjtmvwsvggnswpqpjbtcrnhhhlzbrvhjdstnpctjlgsffrrbfdvjzhwsgthgfsqnvqdcjffsttlrjnhtqqdpfqpjtdgfwcdwzmwfvqgglsrmmqwbszclpzwldwcswpwfwldrfmmdndcptjbmnvgcpntqcdrcffvgnlpjmcqjpfmbmwjfpqzbzhqtqbzsghbnfvhphfzzhfznttpfrqwpmzjchpzzrdclhdltlqbjmjdfdjqlqbwptsghcnvtdscwgpqnlhhvsvglplhlrwpnzmdbsbrlhmpczzfz
diff --git a/flake.nix b/flake.nix
index c07deb8..f7620e5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,6 +11,7 @@
       day03 = pkgs.callPackage ./day03 { };
       day04 = pkgs.callPackage ./day04 { };
       day05 = pkgs.callPackage ./day05 { };
+      day06 = pkgs.callPackage ./day06 { };
     };
   };
 }