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Program 4

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

public class Example1{
  
  public static void Main(){

    // A comma-sep. list of all male first names, youngest first.

    string result = Person.SomePersons
       .Where(p => p.Sex == Sex.Male)
       .OrderBy(p => p.Age)
       .Select(p => p.FName)
       .Aggregate("", (res, nm) => res + " " + nm);

   Console.WriteLine("Result = {0}", result);
                                        // Result =  Per Stig Martin
  }
}