using System;
using System.Linq;
using System.Collections.Generic;
 
public class Test
{
        public static void Main()
        {
                var list = new List<Fact> () {
                            new Fact { Thing = "Roses are", Color = 0xFF0000 },
                                    new Fact { Thing = "Roses are", Color = 0xFF0000 },
                                    new Fact { Thing = "Violets are", Color = 0x0000FF },
                                    new Fact { Thing = "Sugar is", Color = 0x1337 },
                                    new Fact { Thing = "Sugar is", Color = 0x1337 },
                            };
                
                foreach (var item in GetFacts(list)) {
                    Console.WriteLine ("{0:x} {1:x}", item.Thing, item.Color);
                }
        }
        
        public static IEnumerable<Fact> GetFacts(IEnumerable<Fact> list) {
            return list.Distinct();
        }
 
}
 
 
public class Fact
{
    public string Thing { get; set; }
    public int Color { get; set; }
    
    public override bool Equals (object obj)
    {
        if (obj == null) return false;
        
        var x = obj as Fact;
        if (x == null) return  false;
        
        return this.Thing == x.Thing && this.Color == x.Color;
    }
 
 
    public override int GetHashCode ()
    {        
        // http://stackoverflow.com/questions/263400/what-is-the-best-algorithm-for-an-overridden-system-object-gethashcode
        unchecked 
        {
            int hash = 17;
            hash = hash * 23 + this.Thing.GetHashCode ();
            hash = hash * 23 + this.Color.GetHashCode ();
 
            return hash;
        }
    }      
}