using System;
using System.Collections.Generic;
 
interface IEntity
{
    string Name { get; set; }
}
 
class FooEntity : IEntity
{
    public string Name { get; set; }
 
    public FooEntity()
    {
        Name = "foo";
    }
}
 
interface ILetter<T> where T:IEntity
{
    string EntityMetadata { get; set; }
    List<T> GetRecords();
}
 
 
abstract class AbstractLetter<T> : ILetter<T> where T:IEntity
{
    public abstract string EntityMetadata { get; set; }
    public abstract List<T> GetRecords();
}
 
class JobLetter<T> : AbstractLetter<T> where T : IEntity, new()
{
    public override string EntityMetadata { get; set; }
    public override List<T> GetRecords() { return null; }
 
    public JobLetter()
    {
        var entity = new T();
        EntityMetadata = entity.Name;
    }
}
 
 
 
public class Test
{
	static List<T<K>> CreateLetterList<T, K>() where T : AbstractLetter<K>, new() where K : IEntity
	{
	    return new List<T<K>> { new T<K>(), };
	}
 
	public static void Main()
	{
		var jobLetterList = CreateLetterList<JobLetter, FooEntity>();
	    foreach (var letter in jobLetterList)
	    {
	        Console.WriteLine(letter.EntityMetadata);
	    }
	}
}

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