Generate NATO alphabet Anki cards

GenerateNatoAlphabetAnkiCards.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using MoreLinq;

namespace App
{
    public static class GenerateNatoAlphabetAnkiCards
    {
        private static readonly List<NatoAlphabetLetter> Letters = new List<NatoAlphabetLetter>
        {
            new NatoAlphabetLetter {Letter = "A", Word = "Alpha"},
            new NatoAlphabetLetter {Letter = "B", Word = "Bravo"},
            new NatoAlphabetLetter {Letter = "C", Word = "Charlie"},
            new NatoAlphabetLetter {Letter = "D", Word = "Delta"},
            new NatoAlphabetLetter {Letter = "E", Word = "Echo"},
            new NatoAlphabetLetter {Letter = "F", Word = "Foxtrot"},
            new NatoAlphabetLetter {Letter = "G", Word = "Golf"},
            new NatoAlphabetLetter {Letter = "H", Word = "Hotel"},
            new NatoAlphabetLetter {Letter = "I", Word = "India"},
            new NatoAlphabetLetter {Letter = "J", Word = "Juliet"},
            new NatoAlphabetLetter {Letter = "K", Word = "Kilo"},
            new NatoAlphabetLetter {Letter = "L", Word = "Lima"},
            new NatoAlphabetLetter {Letter = "M", Word = "Mike"},
            new NatoAlphabetLetter {Letter = "N", Word = "November"},
            new NatoAlphabetLetter {Letter = "O", Word = "Oscar"},
            new NatoAlphabetLetter {Letter = "P", Word = "Papa"},
            new NatoAlphabetLetter {Letter = "Q", Word = "Quebec"},
            new NatoAlphabetLetter {Letter = "R", Word = "Romeo"},
            new NatoAlphabetLetter {Letter = "S", Word = "Sierra"},
            new NatoAlphabetLetter {Letter = "T", Word = "Tango"},
            new NatoAlphabetLetter {Letter = "U", Word = "Uniform"},
            new NatoAlphabetLetter {Letter = "V", Word = "Victor"},
            new NatoAlphabetLetter {Letter = "W", Word = "Whiskey"},
            new NatoAlphabetLetter {Letter = "X", Word = "X-Ray"},
            new NatoAlphabetLetter {Letter = "Y", Word = "Yankee"},
            new NatoAlphabetLetter {Letter = "Z", Word = "Zulu"},
        };

        public static void DoIt()
        {
            for (int i = 3; i <= 5; i++)
            {
                var lines = LettersWithWordsOnOtherSideOfCard(i, 3);
                File.WriteAllLines($"NATO_Pairs_{i}.txt", lines);
                Console.WriteLine(string.Join(Environment.NewLine, lines));
            }

            var arguments = new[]
            {
                new {NumberOfLetters = 3, NumberOfBlanks = 4, Repeat = 6},
                new {NumberOfLetters = 2, NumberOfBlanks = 4, Repeat = 5},
                new {NumberOfLetters = 1, NumberOfBlanks = 4, Repeat = 4},
            };

            foreach (var arg in arguments)
            {
                var lines = LettersWithBlanksAfterThemAndAllLettersOnOtherSideOfCard(arg.NumberOfLetters, arg.NumberOfBlanks, arg.Repeat);
                File.WriteAllLines($"NATO_Pairs_Blanks_{arg.NumberOfLetters}_{arg.NumberOfBlanks}.txt", lines);
                Console.WriteLine(string.Join(Environment.NewLine, lines));
            }
        }

        private static List<string> LettersWithWordsOnOtherSideOfCard(int batchSize, int repeat)
        {
            var batches = Letters.Repeat(repeat).Batch(batchSize);

            var lines = new List<string>();
            foreach (var batch in batches.Where(x => x.Count() == batchSize))
            {
                var b = batch as IList<NatoAlphabetLetter> ?? batch.ToList();
                lines.Add($"{string.Join(" ", b.Select(x => x.Letter))} ~ {string.Join(" ", b.Select(x => x.Word))}");
            }
            return lines;
        }

        private static List<string> LettersWithBlanksAfterThemAndAllLettersOnOtherSideOfCard(int numberOfShownLetters, int numberOfBlanks, int repeat)
        {
            int totalNumberOfLetters = numberOfShownLetters + numberOfBlanks;
            var batches = Letters.Repeat(repeat).Batch(totalNumberOfLetters);

            var lines = new List<string>();
            foreach (var batch in batches.Where(x => x.Count() == totalNumberOfLetters))
            {
                var b = batch as IList<NatoAlphabetLetter> ?? batch.ToList();
                var lettersWithBlanks = b.Select(x => x.Letter)
                    .Take(numberOfShownLetters)
                    .Concat(Enumerable.Repeat("_", numberOfBlanks));

                var allLetters = b.Select(x => x.Letter)
                    .Take(numberOfShownLetters)
                    .Concat(b.Skip(numberOfShownLetters).Select(x => $"<u>{x.Letter}</u>"));
                lines.Add($"{string.Join(" ", lettersWithBlanks)} ~ {string.Join(" ", allLetters)}");
            }
            return lines;
        }
    }

    public class NatoAlphabetLetter
    {
        public string Letter { get; set; }
        public string Word { get; set; }
    }
}