using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System;

class c
{
    public static void Main()
    {
        var l =
            MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(
            MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(
            MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(
            MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(
            MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(
            MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(
            MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(
            MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(
            MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(
            MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(MakeList(
            MakeList((object)"", 1)
            ))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))));
        Console.WriteLine(l.GetType());
    }


    static IEnumerable<Item> MakeList<Item>(Item value, int count)
    {
        for (int i = 0; i < count; ++i)
            yield return value;
    }

    static IEnumerable<Item> MakeList<Item>(Item value)
        where Item:IEnumerable
    {
        foreach(object o in value)
            yield return value;
    }
}