using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        var sb = new StringBuilder();

        for(var i = 1; i<=6; i++)

        {

            for(var j = 1; j<=6; j++)

            {

                if(i==j || i+j==7) sb.Append("■");

                else sb.Append("□");

                sb.Append(" ");

                if(j==6) sb.Append(Environment.NewLine);

            }

        }

        sb.AppendLine();

        sb.AppendLine("New line");

        sb.Append("This goes to new line");

        sb.Replace("This","This text");

        Console.WriteLine(sb.ToString());       

    }

}