using System;
using System.Linq;
using System.Collections.Generic;
 
public class Test
{
	public static void Main()
	{
		string[] a = { "zeng", "he", "b" };
		string[] b = { "ceng", "huo", "b" };
		string[] c = { "ceng", "hu", "b" };
		string[][] d = { a, b, c };
		List<string> r = new List<string>() { "" };
		List<string> r1 = new List<string>() { };
		for (int i = 0; i < d.Count(); i++)
		{
			foreach (string s in r)
			{
				foreach (string[] s1 in d)
				{
					r1.Add(s + s1[i]);
				}
			}
			r = r1.ToList();
			r1.Clear();
		}
		foreach (string s in r.Distinct())
		{
			Console.WriteLine(s);
		}
	}
}

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