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  1. namespace Problem_6.Songs_Queue
  2. {
  3.     using System;
  4.     using System.Collections.Generic;
  5.     using System.Linq;
  6.     using System.Text;
  7.     using System.Threading.Tasks;
  8.  
  9.     class Program
  10.     {
  11.         static void Main()
  12.         {
  13.             var inputSongs = Console.ReadLine()
  14.                 .Split(new[] { ", " }, StringSplitOptions.RemoveEmptyEntries)
  15.                 .ToArray();
  16.             var songQueue = new Queue<string>(inputSongs);
  17.  
  18.             while (songQueue.Count > 0)
  19.             {
  20.                 var command = Console.ReadLine().Split(new char[] { ' ' }, 2).ToArray();
  21.  
  22.                 if (command[0] == "Play")
  23.                 {                    
  24.                         songQueue.Dequeue();                    
  25.                 }
  26.  
  27.                 else if (command[0] == "Add")
  28.                 {
  29.                     if (songQueue.Contains(command[1]))
  30.                     {
  31.                         Console.WriteLine($"{command[1]} is already contained!");
  32.                     }
  33.                     else
  34.                     {
  35.                         songQueue.Enqueue(command[1]);
  36.                     }
  37.                 }
  38.                 else if (command[0] == "Show")
  39.                 {
  40.                     Console.WriteLine(String.Join(", ", songQueue));
  41.                 }
  42.  
  43.             }
  44.             Console.WriteLine("No more songs!");
  45.         }
  46.     }
  47. }
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