public void Join(CStamp cs1, CStamp cs2)
        {
            _lista.AddRange(cs1.GetLista());

            foreach (var aa in cs2.GetLista())
            {
                if (!_lista.Contains(aa))
                    _lista.Add(aa);
            }
        }
 public bool Leq(CStamp s2)
 {
     return _lista.All(aa => s2.GetLista().Contains(aa));
 }
 public CStamp(CStamp cs2)
 {
     _lista = new List<Atomo>(cs2.GetLista());
 }