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)

    public class Tail
    {
        public static Action<T> RecursiveAction<T>(Action<T> a)
        {
            var methodInfo = Recursive(a.Method);
 
            Action<T> action = p =>
            {
                var t = methodInfo.DeclaringType;
                t.InvokeMember(methodInfo.Name, BindingFlags.InvokeMethod, null, t, new object[] { p });

private void GetHierarchyRecursive(int empId, List<Employee> emps) {
    List<Employee> subEmps = GetEmployeesManagedBy(empId);
    foreach (Employee c in subEmps) {
        emps.Add(c);
        GetHierarchyRecursive(c.EmployeeID, c.ManagedEmployees);
    }
}