/* LINQ Puzzle #10 *******************************************************

Summary:  Assume we have a generic class that forms a tree like the Node class below.
Given an IEnumerable of Nodes, write an extension method that flattens all the nodes
of the tree(s) into a single list of nodes. The method MUST capable of accepting a
generic class. The only assumption you can make is that it has some property that
contains an IEnumerable of children of the same type.

************************************************************************/

void Main()
{
    var nodes = Enumerable.Range(0, 3).Select(x => new Node() {
        Children = Enumerable.Range(0, 3).Select(y => new Node() {
            Children = Enumerable.Range(0, 1).Select(z => new Node()).ToList()
        }).ToList()
    }).ToList();

    // call your extension method here
}

public class Node {
    public Node()
    {
        Guid = Guid.NewGuid();
    }

    public Guid Guid { get; set; }

    public IEnumerable<Node> Children { get; set; }
}

// write your extension method here