diff --git a/advent-of-code-2022.csproj b/advent-of-code-2022.csproj
index 1fc185f..00bfd8a 100644
--- a/advent-of-code-2022.csproj
+++ b/advent-of-code-2022.csproj
@@ -60,6 +60,7 @@
 	  <EmbeddedResource Include="inputs\12a.txt" />
 	  <EmbeddedResource Include="inputs\13.txt" />
 	  <None Remove="inputs\14.txt" />
+	  <EmbeddedResource Include="inputs\13a.txt" />
 	  <EmbeddedResource Include="inputs\14.txt" />
 	  <None Remove="inputs\15.txt" />
 	  <EmbeddedResource Include="inputs\15.txt" />
diff --git a/inputs/13.txt b/inputs/13.txt
index 2f7fb82..4e847c9 100644
--- a/inputs/13.txt
+++ b/inputs/13.txt
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+[[1,8],[0,[[]],[[10,5,5,1,5]],[],2],[[[],[9,0],1,[5]],[10,1,[2,2,7],[]],[1]]]
+[[[[6,10,0],3]],[[[3,6,1,2,3]],[6,0,[]],[[],2,[4,7,8,7]],5]]
+
+[[[[6,3,4],8,4,[9]],1]]
+[[[0,10,8,[10,4,5],[4,9,1,10,5]],1],[[1],9],[[4,[3],[5],6,[6,10,4]],1,10,[[0,4,5,3,6],[0],[8,5,5],[2,5,1,4,6],1]]]
+
+[[1],[[8,[4,6,1],4,2],[],[8,5,[9,1,3,7,1]],10]]
+[[[[4,7,0],3,[5,9,6,6,10],[]],[[9],5],[]],[[4,[1,5]],[10],1],[],[],[[[4,7,1,7]],[10,[0,9,10],[6,10,10,2],3,3],8,[[],3,[9,3,1,4],9],[[0,9,4],[0]]]]
+
+[[1],[7,[[9,7],3,5],[[1,5,0],3,[10],[2,4],[8]]]]
+[[10,2,[[0,1,3,4],[2,9],4,[4,8]]],[8]]
+
+[[8,[]],[[[4,4,4]],6,1,[7,4,2,4]],[5]]
+[[],[4,[0,8,[6],[10]],9]]
+
+[[[6,[4,7],[8],[],[]],0,[9,[9,8,9,0,3],[6],[10,3,8],[8,3,1,5]],7],[[1,8,[],10],10,[[4,1,6,4],[0,5,3],7]],[5,[4,10],[4,6],0,[]],[[6,[10,3,10]],7,[4],[0,[3],0]]]
+[[[[7,10,10,5,4]],9],[10,[[0,5,10,0],0,9,[10,6,1,5]],0,8],[],[[[5,6,1,1],[],4,[7,7,3,8,9]],[0,[1,2]]]]
+
+[[],[9,[3]],[[[],8,10]],[8,[10,[1,5,2]]]]
+[[[[],[4,9],7,[4,2,4]],8,[],0,[[4,10,9,10],[],4,[6,4,5,9],[3,3]]]]
+
+[[2,[4,10,[10,3,10,9,10],10],4,10,[]],[],[]]
+[[[1,[1,1,10]],5],[[[3,6],6,6,[6,7]],[],[],[7,[4]]]]
+
+[[8,9,[[2,8,6,8]],0,[5,5,[2,10,0,1],6,[4,1]]],[[[9,10]],[[],9,0,[9,8]],[],[],3]]
+[[[[],[1,4,5,7],[]],[8],3,2],[[9,4,[0,5,8,2,0]],8,[6,5,1,[9,10,7],5],9],[[[7,6,4],[4],7,0],[8],[[4,1],[2,4,2,7,2],[4,6,5],5],6],[0,7],[[[]]]]
+
+[[2,4,[8,10,[1,0,2,7],[9,7,10,3,4]]],[],[[[1]],1,2,0]]
+[[],[2,4]]
+
+[[5]]
+[[[9,0],5,2,8,[[0,2,8],[3]]],[2],[7,1,[5,[9,4,7]]],[]]
+
+[[1],[[],0,[5,[],[5,7,0,2,1],[]]],[[[6,9,6],0,[],[2,4,10],[5,9]],8,3,[[2,3,4],[2,10]],[[10,9,0],[2,9,2,6,8]]],[[[10,4,7,5],7],6]]
+[[1],[[],[[],2,3,[6,7,3],10],2,[]],[7],[[[10],5,[3,2,2,10]],[[3,3,0,4,4]],[[8,1,8,7,10],[8,6,9,6,9],2,[0,7,4,9,6],[3,7,0,0,3]],[],8]]
+
+[[4,5],[[9,0,[3,0,0],4],4,6]]
+[[3,7,10,[4,9,1,0],[]]]
+
+[[8,3,[[7,9,9],[9,7,1,5]],[7,2,[6]],10],[10,[],[[7,0,5],[],[],2],[]],[6,[8,[2],[3,4,10],[7,2],4],[],3],[4,[6],9,[0,[4,4,1,4,7],[0],2,9],3],[1]]
+[[4,[]]]
+
+[[[[2,3,7,8],10,[]],9,[[5,2,4]],9,[8,[4],10,0]],[[],[[7,3],7,[7,0,1,8],[5,6],7],10,[[1],[7,4,4,0,4],3,4],6],[],[5,[],[1,[6,5]]]]
+[[[10,[1,7,6],8],[10,[],6,[]],8],[6],[9,[[0,6,9,3],4,[],[],[7]],0],[]]
+
+[[9]]
+[[],[1,[[8,10,6],9,[1,5]]],[1,6],[]]
+
+[[[1,2],2],[[[8,7,10],0],7],[9]]
+[[0],[[]],[8,[[10,7,1,5,1],9,9,[],3],[0,[8,6,3],[2,4]],1]]
+
+[[[10,1,9,[],[0,4]],6,9,5],[[4,[],[2,2,8,9],2,[0]]],[1,8,2],[6,3,0,[[10,10,8,3]]],[[[2,5],[2,2,0,7,4]],1]]
+[[],[[]],[],[1,3],[[9],[1],7,4,[[7,7,8]]]]
+
+[[[6,[6,6,6,6],[3,9,7],3],8,10],[[1,8,1]]]
+[[5],[],[7,7,[],9,2],[[9,[5,1,3]],[[9,6,5],[0,4],[4,7,7],[]],[[2,7]]],[[10,[10,5,10],7,[1,6]],[0,3,10,2],10]]
+
+[[[0,5,[4,1,2,4,0]],5],[5,[]]]
+[[6,[[],[9,7],[7,0,5],[1]],[[2,1,1,4,5],[6,8],[2,4,3]]],[[9,8,[3,7,5,10,0],[7,10,9,10,6]],2],[[[8,4,1,2]],2,[5,9],[[4]],3]]
+
+[[[10,[4],[10,9]],0,[1,9,[10,6,5],1,[2,6,2,5]],[]],[[[],[3,4,7,5],4,[0,0,8,0,6],[]]]]
+[[],[1],[[[6,0,7,9]],7,4,5,[[3,5]]],[]]
+
+[[],[1],[[[7,6,5,3,7],[9],[4,1]]]]
+[[[[9],[]],[],[[8,10,10]],[],[]],[]]
+
+[[7]]
+[[[],[1,[],[],[4,4,8]],0,0],[0,1],[1,[[10,7,6,8,4]],[[9]],1],[]]
+
+[[1,3,6],[],[],[[2,6,[2,3]],0,8,5,6]]
+[[[[5,4,1]],7,[[8,6]]],[[10],[[],[8,10],3,[]],3],[4,[7,8,5,[6,5,10,7,4],[]],[[6,5,0,0,4],0,[9,9,1]],10]]
+
+[[0],[[[3],3,0,[7,2,4]],5],[7,5],[]]
+[[0,[[2,7,4,3,9],[2,5]],[6,3,1]],[],[3],[[9,[],1,0,2],7,10]]
+
+[[],[[9],[[],8,10,1],[[8,5,6],6,[]]],[[[10,1,6],5,[],7,10],[7,2],[3,3,6,[8,0,7,3,3],[9,9]]]]
+[[[[8],5],0,7],[2,0,5,[],4],[10,[],7,[[8,6,0],3,[9,9,9,7],5],6]]
+
+[[],[2,[9,9,[1,6,8,9,4],[]],6,[]],[7,[[4,7],9,[],5,9]],[2,[5]],[1]]
+[[7,[4,8,[],3,[1,5,5]],2,7,[[10,1],[2,9,0,1,10],4,7,[3,7]]],[6,7,9,[[9,10,10,2],6],[[4],1]],[[8,9,[8,6,3],0]]]
+
+[[[[8,8,10,3,3],[6,7,5]]],[5,[[],[8,1]],[6]],[9,[]]]
+[[],[]]
+
+[[[[5,7,8],[4]],[[8,6,10,10],[0]],[1,9]],[[10,[],2,3,[6,3,9,0,7]],10,2,9,5],[6,[0,[],10]],[],[[[3,5,7,5],[],[1,2,7],1],[0,[9,10],[4,7,5]]]]
+[[[7,[9,8],[2,6,0,5],[9],[9,7]],[[7,0,0,5,10],[9,7,3]]],[[1,[6,0,8,7,7],[3,2]],10,[3,3,[8]]],[6],[9,[1,[2,8,5],2],1],[6,[[5,1,3,3,7],[],10],4]]
+
+[[9,7],[2]]
+[[[[]]],[[2,2,5],[[6,1,1,4,9],0,6,8,4],[3,[8]]],[9,3,2,2,[0,9,9,[1,4,3,8,7],[2,4,6,4,1]]]]
+
+[[],[5,[5,[3],[5,10],5],[[1]],0],[[[9,8,5],10,4]],[]]
+[[[6,[],[],9]],[[0,[],[10,10,7,9,7],[8,7]],6,1,4],[6,3,[7],4],[[4]],[2,[],6]]
+
+[]
+[[],[5,[10,[1,1],[7,10,4,6],[10]]]]
+
+[[5,8,[8,1,[10]]],[],[7,9,[5,[7],1,[10,6,6]]]]
+[[[[6,8,7],[4,5],1,8],4,1,10,3],[7,1,[7,2],9],[],[3,[[1,7,10],[0],2,[1,9,1,5,2]],[[],9,2,[]],[5],2]]
+
+[[],[6,[[9,3,9,6,3],[8,5],[0]],7,[]],[[]],[1,[]],[[[0,1,2],[7,5,10,10,8],[3,10,3,2]],[[5,2,10,1],[5,7,5,1,7],10],5,[]]]
+[[[[10,5,5,4,10],[9],[6,10,3,7,4],[7,5,8]],[3]],[7,5,[0],[[5,0,2,10],[],5,[],6]],[10,[[10]],9,[[8,3,10,6],[0,4,9,9,9],10]],[4,[2,3]],[[[],[7]]]]
+
+[[[[10,9,8,8,8]],7],[7,8,5]]
+[[[[10,8,7,7,1]],[7,[]],[[],[],7,4,[8,7,2,6]]],[[[2,2,7,7],6,[],7,[]],2,[1,8],10,[2,6]],[5,0,[[7,7,10,8,2],10,[10]],9],[[[7,2,3,0,6],9,[6,5,0,0,7],[9,9,1,8]],0],[2,5]]
+
+[[6,6],[[8,[7,8]],[[],10,0,[2,2,8]],[[9,0,6]],10],[[2,[0,6,4],[],[],3]],[[3,7,[4,8,4,2]],4]]
+[[3,3,[[],0],9],[],[6,[9,[4,7,9,7],3,9,3],[]],[[3,[],[2,9,10,1,3]],[4,6],8,[8,[1,2],9,[]],[1,[3,1],[9,7,6,4,6]]],[[[5],[7,8,3,1],10,[8]],2,10]]
+
+[[[0,6],[[10,1,0,0],[]],[[],3]]]
+[[],[7,3,[[4,6,8]],[8,[6,0,3],1,7],[[6,8]]],[1,[6]]]
+
+[[0,[7,5],[[],5,[8,6,5,8],0,10],[9,[10,0],5,[4,10],[7,1,3]],4],[1,[[9,7,9],8,1,7,[0,0]],[5,[10,6],4,7,4]]]
+[[5,2,[],[0,8,[8,5,9]]],[],[0],[1,[[5,10,7],[5,6,7,5],[0]],[1]]]
+
+[[0]]
+[[[[3,9],9,[1],[3,9,9,0,2]],2,[[9,1,7,0,9]],[],8],[],[[[],[],1,0,[0]],7],[9,[8,2,[7,3,1,0],[5,9,8]],4]]
+
+[[],[3],[[],3,4],[[[7,0]],[[9,3,6,7,3],[6,5,4],0,[2]]],[8]]
+[[1,[[9,0,2,5],[5,2,9]],[[1,2,2],[2,7,2,5,5],[6,3,10,8,7]],4,7],[3],[[[2,9],4,[10]],8],[1,0,10]]
+
+[[[[10,0,9]]],[2]]
+[[[0]],[10,2,8],[],[[[0],4,[4,7],0,9],[[1],2,[3,6,6,6]],4],[3,3]]
+
+[[],[3],[2]]
+[[7,4,[3,[2,3,0],9],[[0,2,7,1],[9,6,5,7,2],8,[6,10,5,8,1],[9,1,7,6,5]]]]
+
+[[],[[],1,2,[[9,5,3,3],9,9,3,1]]]
+[[[3,0],9,[3,[6,6,4,9]],[1,6,9,[8,5]],[[8,5,7,9,6],[3]]],[[8],2,[[],[6],[5,6,10,5,8],3]],[10],[]]
+
+[[[[7,3,9,4,10],5,9,0,[]],[],[5,0,0,[5,4,0],0],[[4,0,7],7,[10,9,1,10],[5,8],4],10],[[],8,6,10,[[0],[],[9,0],3,6]]]
+[[[4,[0,6,2,5],10],0]]
+
+[[2],[8,[4],[],9],[],[4,6],[]]
+[[[10],[4,[7,9],[10,8]],[[4,1,8,5,6]],[[8],[3,2]],4]]
+
+[[[[6,3]],[[4,9],7,5,1],[],[],[7,4,[7]]]]
+[[[[],9,[1],[10,8,7],7],0,0,0,[[6,6],[2,10],6,[0],[]]],[[]],[[[8,6,10]],7,4],[[[8,0],[4,3,4,9],[9]],[[6,9,3,1,0],[10,0,5],[],[10],0],0,[]]]
+
+[[[],5,5,[]],[[3],2],[1,[[1,2,10,7,3],6],1,2,[[2,9,4,8],6,[9,0,10,8,5]]],[],[]]
+[[1,0,0,3,[[10,10,10,6],[0,5,8],[3,9,9],10,0]],[3]]
+
+[[[],[4,8],5,6,[1,4,5,6,[2]]]]
+[[[],[9,10,2]]]
+
+[[[[1,2,8,10,10],3,[2],[2]],8],[1,10],[8,[10,[6,3,0,1],3],[[8,10],[9,1,2,9]]]]
+[[[6,[7,10],[8,9],[5],10],[[4,2]],[4,10,[9]],0],[3,[[8,10,6],[1,4,4],2,10,2],10,[7,[2],[9,1,4,4],[6,0]]],[3,4,10,6]]
+
+[[[[9],1]],[0,[2],[[4,0,1,5,2]],4,10],[],[[],0,5],[5,[],[2,[5],[5,1,3,7,10],4],[],[]]]
+[[5,9,[9,[8],8,[2,8,9,7]],[3,[2,2,6],[8,6],1],[[6,8,4,9,8],3,6,[0,4,6,10],3]],[[[5,0,2],[9,3,1],[6,3,10],4],0,3,[5,8,[0,10,10,5],9]],[[[10]],9],[],[[9,6,2,4]]]
+
+[[1],[4,[[0,5,1,7],[4,7,3],[0,6,8,3,6],[4,3,6]],[],[[8,3,3,10,3],[2,5,9,1,10]]],[4,[6,2,0]]]
+[[4,[[4,4],[0,3,5,9],2,[6,9,5,4,1],7]],[[[7,8],1,[8,9,2],2,10],[[]]],[[2],[1,8,[3,4]],[4,1,[6,5,7],6],[10,[4,10,0,2,9],[1,4]],[[],[2,1,0,5,1],0]],[[2,10],10],[[[],[]],5,[[],[7,9,3,0,10],3]]]
+
+[[[[2],[10,9,7]],0],[[1],10,2],[[10],[],3,[],[1,[],2,7,9]],[[[]],6,1,8,[[4],[],8,[10,6]]]]
+[[7,0,[1],0],[[[5,8,1],0,10,10],6,[4],7,8]]
+
+[[1,[9,[0],[8,3]],[9,10,[5,10],[7,7,1,8],[7]],[[],[5,0,8],2,5]],[],[6,0,10],[0,4,10,[],[3,2,5]],[]]
+[[10,2,4,10],[[[]],[[1]],9],[]]
+
+[[4],[[],6,[7,[6,10,3,1],4,[7,10,9,10]],7],[3,[4,[5]],[4],0]]
+[[[[7,8,4,4],[4,1,1,2],[6,9],4],[[]]],[],[[2,[7,6],[8,5,0,4]],8,2],[[10,10],[[9],10,5,[8,1,6,5]]]]
+
+[[[[],10,[8,9,8,7],[7,0]],1,8,6]]
+[[],[5,10,[1,[],[3,4,9,7]],6],[[[4,9,7,6],9,[5,5]],[4],2],[]]
+
+[[9,1,[[10,9,2,3,1],9]],[3,5,4],[4],[[[5,3,8,6,1],1,[0],[2,8,9,4],[4,2,2,6,5]],[7,[10,6,2],[1],[9]],[]],[[[7,1],[6,6,2,5]],3,3,[[2,0,8],1]]]
+[[[1],[4]],[[8,7,3,[0,9,0]],[]]]
+
+[[[],7],[[],6,[0,[4,4,3,5,3],4,[]],4,[[4,4],[1,1],2,0]]]
+[[],[4],[5,3,[2,[10]],[[5],[7,4,1,6,10],2,8,[1]]],[[5,4,5,[],[3,8]],[]]]
+
+[[[[9]]],[],[9,[8],8],[[7,[],4],8,[[],1,[0,4,7],[3,10,6]]]]
+[[9],[5,[6,7],1,7],[[[0],9,1,[]]]]
+
+[[[],[[5,7,2,5],[4],[9,2,9,7],1,0],[3,[8,10,8,1,9],9,[9,6,8,9],[]],1,7],[[9],6,[],8],[[6,2,[6,2,10,8,4],8,[10]]]]
+[[],[],[]]
+
+[[5,[[6],[9,6]],[[4,8,8,5],[],1],[[4],[5,5,2,0,2]]],[10,[[1,5],[8,7,9,9,7],[]],[[1]],[[10,10,0,1],[1,9],[1,4,4],6,1]],[],[6,7,[5,[9,4,10],[1,1,1,5,1]],9,6],[]]
+[[[[5,3],2],[3,[0,1,6,4]],4,[[0,5,3,8,9],[0,0],[5,9,2],0,[5,2,3,6,5]]],[[],[[9,7,4,2,3],9],2,[6,10,[4,0],[1,0,8,7]],6],[9],[[[4,4],9,[5,6,4,1],[0,2,1]],[5,[4,8,9,6,2],[0,1,8]]]]
+
+[[3,5,6,8],[3],[[[7,2,7,5,9],[2,7,10,4]],1,6],[7,[[5,3,2,0,0]],[9],6]]
+[[[3,2,6,6,1],[0,10],[7,[]],2,2],[],[]]
+
+[[[7,[7,2]],[9],[2],8],[],[[9,[1,4],[8],6],[3,3]],[[[6,9,4],[10],3,[8,10,4],1]]]
+[[[2,[],4,10],5,[5,[],[5],7,9]],[[[7,1,9],6,[7,10,6],10,2],[[5]],[[4,4,9,4,7]]]]
+
+[[],[[0,4,[8,3,4,8],5,2],10,5,[10,8,3],3],[5,6],[8,3,[[3,7,3,1,5]],[]]]
+[[[],4,8,8,4],[[8,[5],[5,10,0],[1,6,9,0,7]],[[],[5,10,7,4]],[],[[5,8,9,4,7],[7,3,10,7,8],[],[0,2,8,9]]],[[5],3,4],[[[8]],5]]
\ No newline at end of file
diff --git a/inputs/13a.txt b/inputs/13a.txt
new file mode 100644
index 0000000..b3a0472
--- /dev/null
+++ b/inputs/13a.txt
@@ -0,0 +1,23 @@
+[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]
\ No newline at end of file
diff --git a/src/13.cs b/src/13.cs
new file mode 100644
index 0000000..6cf63f1
--- /dev/null
+++ b/src/13.cs
@@ -0,0 +1,209 @@
+using System.Text;
+
+namespace aoc2022;
+
+internal class Day13 : Day
+{
+    abstract class entry
+    {
+    }
+
+    class packet : entry
+    {
+        public packet(params entry[] _entries)
+        {
+            entries = new List<entry>(_entries);
+        }
+
+        public readonly List<entry> entries;
+        public packet? parent;
+
+        public override string ToString() => $"[{string.Join(",", entries)}]";
+    }
+
+    class entryint : entry
+    {
+        public entryint(int _num)
+        {
+            num = _num;
+        }
+
+        public readonly int num;
+        public override string ToString() => $"{num}";
+    }
+
+    private readonly List<(packet, packet)> packets = new();
+    internal override void Parse()
+    {
+        packet? one = null;
+        packet? two = null;
+        foreach (var line in Util.Parsing.ReadAllLines("13"))
+        {
+            if (string.IsNullOrEmpty(line))
+            {
+                continue;
+            }
+
+            if (one == null)
+            {
+                one = parsePacket(line);
+            }
+            else if (two == null)
+            {
+                two = parsePacket(line);
+
+                packets.Add((one, two));
+                one = null;
+                two = null;
+            }
+        }
+    }
+
+    private packet parsePacket(string line)
+    {
+        packet? curr = new();
+
+        StringBuilder sb = new();
+        for (int i = 1; i < line.Length-1; i++)
+        {
+            var ch = line[i];
+            switch (ch)
+            {
+                case '[':
+                    packet embedded = new() { parent = curr };
+                    curr!.entries.Add(embedded);
+                    curr = embedded;
+                    break;
+
+                case ']':
+                    if (sb.Length > 0)
+                    {
+                        curr!.entries.Add(new entryint(int.Parse(sb.ToString())));
+                    }
+
+                    sb.Clear();
+                    curr = curr!.parent;
+                    break;
+
+                case ',':
+                    if (sb.Length > 0)
+                    {
+                        curr!.entries.Add(new entryint(int.Parse(sb.ToString())));
+                    }
+
+                    sb.Clear();
+                    break;
+
+                default:
+                    sb.Append(ch);
+                    break;
+            }
+        }
+        if (sb.Length > 0)
+        {
+            curr!.entries.Add(new entryint(int.Parse(sb.ToString())));
+        }
+
+        return curr!;
+    }
+
+    private bool? isValid((packet, packet) pair)
+    {
+        for (int i = 0; i < pair.Item1.entries.Count; i++)
+        {
+            if (pair.Item2.entries.Count <= i)
+            {
+                return false;
+            }
+
+            var left = pair.Item1.entries[i];
+            var right = pair.Item2.entries[i];
+            if (left is entryint li && right is entryint ri)
+            {
+                if (li.num < ri.num)
+                {
+                    return true;
+                }
+
+                if (li.num > ri.num)
+                {
+                    return false;
+                }
+            }
+            else if (left is packet ll && right is packet rl)
+            {
+                var valid = isValid((ll, rl));
+                if (valid.HasValue)
+                {
+                    return valid;
+                }
+            }
+            else
+            {
+                var one = left as packet;
+                var two = right as packet;
+                if (left is entryint ei1)
+                {
+                    one = new packet(ei1);
+                }
+                else if (right is entryint ei2)
+                {
+                    two = new packet(ei2);
+                }
+
+                var valid = isValid((one!, two!));
+                if (valid.HasValue)
+                {
+                    return valid;
+                }
+            }
+        }
+
+        if (pair.Item1.entries.Count < pair.Item2.entries.Count)
+        {
+            return true;
+        }
+
+        return null;
+    }
+
+    internal override string Part1()
+    {
+        List<int> validIndices = new();
+        for (int i = 0; i < packets.Count; i++)
+        {
+            var pair = packets[i];
+            var valid = isValid(pair);
+            if (valid != false)
+            {
+                validIndices.Add(i + 1);
+            }
+        }
+
+        return $"Sum of valid indices (1-based): <+white>{validIndices.Sum()}";
+    }
+
+    internal override string Part2()
+    {
+        var sentinels = new List<packet>
+        {
+            parsePacket("[[2]]"),
+            parsePacket("[[6]]"),
+        };
+        var l = new List<packet>(sentinels);
+        foreach (var p in packets)
+        {
+            l.Add(p.Item1);
+            l.Add(p.Item2);
+        }
+        l.Sort((a, b) => isValid((a, b)) != false ? -1 : 1);
+
+        int total = 1;
+        foreach (var s in sentinels)
+        {
+            total *= l.FindIndex(p => p.ToString() == s.ToString()) + 1;
+        }
+
+        return $"Sum of sentinel packet indices (1-based) after sorting: <+white>{total}";
+    }
+}