using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] presidents = {"Ad", "Art", "Buch", "Bush", "Car", "land"};
IEnumerable<char> chars = presidents.SelectMany(p => p.ToArray());
foreach (char ch in chars)
Console.WriteLine(ch);
}
}
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