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6 files changed

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‎2025/Day12/README.md‎

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## --- Day 12: Christmas Tree Farm ---
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You're almost out of time, but there can't be much left to decorate. Although there are no stairs, elevators, escalators, tunnels, chutes, teleporters, firepoles, or conduits here that would take you deeper into the North Pole base, there <em>is</em> a ventilation duct. You jump in.
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After bumping around for a few minutes, you emerge into a large, well-lit cavern full of Christmas trees!
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_Visit the website for the full story and [full puzzle](https://adventofcode.com/2025/day/12) description._

‎2025/Day12/Solution.cs‎

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namespace AdventOfCode.Y2025.Day12;
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using System;
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using System.Linq;
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using System.Text.RegularExpressions;
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record Todo(int w, int h, int[] counts);
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[ProblemName("Christmas Tree Farm")]
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class Solution : Solver {
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public object PartOne(string input) {
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// 🎄 🎄 🎄 rotfl
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var blocks = input.Split("\n\n");
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var areas = (
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from block in blocks[..^1]
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let area = block.Count(ch => ch == '#')
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select area
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).ToArray();
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var todos = (
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from line in blocks.Last().Split("\n")
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let nums = Regex.Matches(line, @"\d+").Select(m => int.Parse(m.Value)).ToArray()
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let w = nums[0]
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let h = nums[1]
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let counts = nums[2..]
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select new Todo(w, h, counts)
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).ToArray();
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var res = 0;
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foreach(var todo in todos) {
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var areaNeeded = Enumerable.Zip(todo.counts, areas).Sum(p => p.First * p.Second);
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if (areaNeeded <= todo.w * todo.h) {
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res ++;
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}
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}
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return res;
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}
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}

‎2025/Day12/input.in‎

24.5 KB
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‎2025/Day12/input.refout‎

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‎2025/SplashScreen.cs‎

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Original file line numberDiff line numberDiff line change
@@ -8,24 +8,24 @@ public void Show() {
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var color = Console.ForegroundColor;
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Write(0xcc00, false, " ▄█▄ ▄▄█ ▄ ▄ ▄▄▄ ▄▄ ▄█▄ ▄▄▄ ▄█ ▄▄ ▄▄▄ ▄▄█ ▄▄▄\n █▄█ █ █ █ █ █▄█ █ █ █ █ █ █▄ ");
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Write(0xcc00, false, " █ █ █ █ █ █▄█\n █ █ █▄█ ▀▄▀ █▄▄ █ █ █▄ █▄█ █ █▄ █▄█ █▄█ █▄▄ /* 2025 */\n \n ");
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Write(0xcc00, false, " ");
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Write(0xffffff, false, ".' ____ ' ");
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Write(0xffff66, true, "* ");
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Write(0xffffff, false, "' . ' . ");
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Write(0xcc00, false, " █ █ █ █ █ █▄█\n █ █ █▄█ ▀▄▀ █▄▄ █ █ █▄ █▄█ █ █▄ █▄█ █▄█ █▄▄ /^2025$/\n \n ");
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Write(0xcc00, false, " ");
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Write(0xffffff, false, ". . ____ . .. ");
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Write(0xffff66, true, "* ");
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Write(0xffffff, false, ". '' . ");
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Write(0xff9900, false, "<");
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Write(0xffffff, false, "o . ' \n ________/");
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Write(0xffffff, false, "o ' \n ________/");
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Write(0x999999, false, "O___");
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Write(0xffffff, false, "\\__________");
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Write(0xff0000, false, "|");
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Write(0xffffff, false, "_________________O______ ");
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Write(0xcccccc, false, " 1 ");
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Write(0xffff66, false, "**\n ");
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Write(0x32211a, false, ". ");
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Write(0x32211a, false, "' ");
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Write(0x999999, false, "_______");
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Write(0xaabbcc, false, "||");
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Write(0x999999, false, "_________ ");
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Write(0x32211a, false, "''' '. . . '... . \n . ");
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Write(0x32211a, false, ". ' ' ' ' ' . ' \n .' ");
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Write(0x999999, false, "| ");
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Write(0x9b715b, false, "_");
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Write(0xbb66ff, false, "@");
@@ -37,8 +37,8 @@ public void Show() {
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Write(0xff0000, false, "'.");
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Write(0x999999, false, "|_ _________________________ ");
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Write(0xcccccc, false, " 2 ");
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Write(0xffff66, false, "**\n ");
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Write(0x32211a, false, ". ");
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Write(0xffff66, false, "**\n ");
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Write(0x32211a, false, ".. ");
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Write(0x999999, false, "|_");
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Write(0xff0000, false, "&");
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Write(0x999999, false, "_");
@@ -62,8 +62,8 @@ public void Show() {
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Write(0x666666, false, ". ");
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Write(0xff0000, false, ".");
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Write(0x666666, false, ". ");
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Write(0x999999, false, "| \n ");
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Write(0x32211a, false, "' . '... ");
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Write(0x999999, false, "| \n ");
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Write(0x32211a, false, "' ..' .' ' ");
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Write(0x999999, false, "\\_");
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Write(0xaabbcc, false, "]");
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Write(0x999999, false, "__");
@@ -80,7 +80,7 @@ public void Show() {
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Write(0x999999, false, "_| ");
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Write(0xcccccc, false, " 3 ");
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Write(0xffff66, false, "**\n ");
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Write(0x32211a, false, "'' . . ' '. '. ");
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Write(0x32211a, false, ".' .. ''. ' . ' ");
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Write(0x999999, false, "____________");
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Write(0xaabbcc, false, "//");
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Write(0x999999, false, "___ \n __________________________ ");
@@ -137,15 +137,15 @@ public void Show() {
137137
Write(0x999999, false, "_");
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Write(0x9b715b, false, "T");
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Write(0x999999, false, "_");
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Write(0xaa7744, false, "...' ");
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Write(0x32211a, false, ".. ' '' .. ");
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Write(0xaa7744, false, "...' ");
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Write(0x32211a, false, ".' . ' . ? ");
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Write(0xcccccc, false, " 5 ");
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Write(0xffff66, false, "**\n ");
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Write(0x9900, false, "|| ");
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Write(0x999999, false, "____________ ");
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Write(0x32211a, false, ".. ");
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Write(0x999999, false, "_______________________ ");
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Write(0x32211a, false, ". \n ");
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Write(0x32211a, false, ".' ");
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Write(0x999999, false, "_______________________ ");
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Write(0x32211a, false, "? \n ");
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Write(0x999999, false, "_");
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Write(0x9900, false, "||");
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Write(0x999999, false, "__/");
@@ -157,8 +157,8 @@ public void Show() {
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Write(0xff0000, false, "~ ");
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Write(0xff00, false, ".'");
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Write(0xff0000, false, "'. .");
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Write(0x999999, false, "| ");
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Write(0x32211a, false, "? ");
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Write(0x999999, false, "| ");
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Write(0x32211a, false, "' ");
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Write(0xcccccc, false, " 6 ");
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Write(0xffff66, false, "**\n ");
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Write(0x999999, false, "|");
@@ -195,8 +195,8 @@ public void Show() {
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Write(0xaabbcc, false, "| ");
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Write(0x999999, false, "| ");
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Write(0xcccccc, false, " 7 ");
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Write(0xffff66, false, "**\n ");
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Write(0x32211a, false, "' '' ' .. ");
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Write(0xffff66, false, "**\n ");
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Write(0x32211a, false, ".' . . ");
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Write(0xffff66, false, "'...");
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Write(0x999999, false, "|");
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Write(0xffff66, false, "<>");
@@ -214,8 +214,8 @@ public void Show() {
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Write(0x9b715b, false, "[");
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Write(0x999999, false, "_");
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Write(0xaabbcc, false, "O");
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Write(0x999999, false, "_| \n __________________________ ");
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Write(0x32211a, false, "' . ");
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Write(0x999999, false, "_| \n __________________________ ");
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Write(0x32211a, false, "' . ");
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Write(0xaabbcc, false, "| ");
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Write(0xcccccc, false, " 8 ");
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Write(0xffff66, false, "**\n ");
@@ -265,31 +265,76 @@ public void Show() {
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Write(0xaabbcc, false, "|");
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Write(0x999999, false, "_| \n _________");
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Write(0xaabbcc, false, "||");
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Write(0x999999, false, "______");
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Write(0x666666, false, " ______________________________ ");
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Write(0x999999, false, "______ ______________________________ ");
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Write(0xcccccc, false, "10 ");
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Write(0xffff66, false, "**\n ");
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Write(0x999999, false, "| ");
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Write(0xaabbcc, false, "___ ");
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Write(0xff00, false, "'..");
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Write(0x999999, false, "|");
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Write(0x666666, false, " | | \n ");
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Write(0x999999, false, "|_");
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Write(0x999999, false, "| |");
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Write(0xff0000, false, "'..'");
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Write(0xff00, false, "'..'");
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Write(0xff0000, false, "'..'");
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Write(0xff00, false, "'..'");
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Write(0xff0000, false, "'..'");
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Write(0xff00, false, "'..'");
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Write(0xff0000, false, "'..'");
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Write(0x999999, false, "| \n |_");
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Write(0xaabbcc, false, "|");
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Write(0xff0000, false, "'");
280-
Write(0xff00, false, "..");
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Write(0xff00, false, ".");
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Write(0xff0000, false, ".");
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Write(0xaabbcc, false, "|");
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Write(0x999999, false, "_");
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Write(0xaabbcc, false, "(");
284290
Write(0x666666, false, ":::::");
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Write(0xaabbcc, false, ")");
286-
Write(0x999999, false, "_|");
287-
Write(0x666666, false, " | ^ ^ ^ ^ | ");
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Write(0x999999, false, "_| | ");
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Write(0xffff66, true, "* ");
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Write(0x9900, false, "() ");
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Write(0xffff66, true, "* ");
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Write(0x9900, false, "() ");
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Write(0xffff66, true, "* ");
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Write(0x9900, false, "() ");
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Write(0xffff66, true, "* ");
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Write(0x999999, false, "| ");
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Write(0xcccccc, false, "11 ");
289-
Write(0xffff66, false, "**\n ");
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Write(0x333333, false, " | .--. | <^> <^> <^> <^> | \n '------' '---#_<<^>>__<<^>>");
291-
Write(0x333333, false, "__<<^>>__<<^>>_| ");
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Write(0x666666, false, "12\n \n");
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Write(0xffff66, false, "**\n ");
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Write(0x32211a, false, "'. ");
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Write(0xaabbcc, false, "| ");
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Write(0x32211a, false, "''' ");
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Write(0xaabbcc, false, ".--. ");
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Write(0x999999, false, "| ");
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Write(0x9900, false, "<");
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Write(0xff0000, false, "o");
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Write(0x9900, false, "> <^");
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Write(0xff00, false, "o ");
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Write(0x9900, false, "<");
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Write(0xffff, false, "o");
314+
Write(0x9900, false, "> ");
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Write(0xbb66ff, false, "o");
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Write(0x9900, false, "^> ");
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Write(0x999999, false, "| \n ");
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Write(0x32211a, false, "'' ");
319+
Write(0xaabbcc, false, "'------' '---#");
320+
Write(0x999999, false, "_");
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Write(0x9900, false, "<<^");
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Write(0xff9900, false, "o");
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Write(0x9900, false, ">");
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Write(0x999999, false, "__");
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Write(0x9900, false, "<");
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Write(0xffff66, false, "o");
327+
Write(0x9900, false, "^>>");
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Write(0x999999, false, "__");
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Write(0x9900, false, "<<^>");
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Write(0x66ff, false, "o");
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Write(0x999999, false, "__");
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Write(0x9900, false, "<<^");
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Write(0xff0000, false, "o");
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Write(0x9900, false, ">");
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Write(0x999999, false, "_| ");
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Write(0xcccccc, false, "12 ");
337+
Write(0xffff66, false, "**\n \n");
293338

294339
Console.ForegroundColor = color;
295340
Console.WriteLine();

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