class PowerSet
{
    static void Main(string[] args)
    {
        var set = Enumerable.Range(0, 8);
        foreach (var subSet in PowerSets(set))
            Console.WriteLine(String.Join(" ", subSet));
    }
 
    private static IEnumerable<IEnumerable<T>> PowerSets<T>(IEnumerable<T> masterSet)