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    static class Dumper
    {
        public static string Dump(Node root)
        {
            var sb = new StringBuilder();
            foreach (var line in dump(root))
                sb.AppendLine(line);
            return sb.ToString();
        }

        static private IEnumerable<string> dump(Node root)
        {
            yield return root.Text;
            if (root.Children.Count == 0)
                yield break;
            for (int i = 0; i < root.Children.Count; i++)
            {
                bool firstLineOfChild = true;
                bool lastChild = i == root.Children.Count - 1;
                foreach (var line in dump(root.Children[i]))
                {
                    string prefix = lastChild
                        ? (firstLineOfChild ? "└─" : "  ")
                        : (firstLineOfChild ? "├─" : "│ ");
                    yield return prefix + line;
                    firstLineOfChild = false;
                }
            }
        }
    }

1	-
1	+	static class Dumper
2		{
3		public static string Dump(Node root)
4		{
5		var sb = new StringBuilder();
6		foreach (var line in dump(root))
7		sb.AppendLine(line);
8		return sb.ToString();
9		}
10
11		static private IEnumerable<string> dump(Node root)
12		{
13		yield return root.Text;
14		if (root.Children.Count == 0)
15		yield break;
16		for (int i = 0; i < root.Children.Count; i++)
17		{
18		bool firstLineOfChild = true;
19		bool lastChild = i == root.Children.Count - 1;
20		foreach (var line in dump(root.Children[i]))
21		{
22		string prefix = lastChild
23		? (firstLineOfChild ? "└─" : " ")
24		: (firstLineOfChild ? "├─" : "│ ");
25		yield return prefix + line;
26		firstLineOfChild = false;
27		}
28		}
29		}
30		}