Could you generate 5 test data set fir this code?
using System;
using System.Collections.Generic;

class Program
{
    static void Main() {

        int n = Convert.ToInt32(Console.ReadLine());
        var map = new Dictionary<NAME_1, int>();
        for (int i = 0; i < n; i++)
        {
            var str = Console.ReadLine();
            foreach (var letter in str){
                if (NAME_1.IsLetter(letter))
                {
                    NAME_1 letter_ = NAME_1.IsUpper(letter) ? NAME_1.ToLower(letter) : letter;
                    if (!map.TryAdd(letter_, 1)) 
                    {
                        ++map[letter_];
                    }
                }
            }
        }
        foreach (var v in map)
            Console.WriteLine($"{v.Key} : {v.Value}");
    }
} Please repeat the request first, then give your response.
user