private void Validate(PrgPopulation pop)
        {
            IList<IGenome> list = pop.Flatten();
            Assert.AreEqual(2, list.Count);

            EncogProgram prg1 = (EncogProgram)list[0];
            EncogProgram prg2 = (EncogProgram)list[1];

            RenderCommonExpression render = new RenderCommonExpression();
            Assert.AreEqual("(x+1)", render.Render(prg1));
            Assert.AreEqual("((x+5)/2)", render.Render(prg2));
        }