public void TestDepth()
        {
            EncogProgramContext context = new EncogProgramContext();
            context.DefineVariable("x");

            StandardExtensions.CreateAll(context);

            PrgGrowGenerator rnd = new PrgGrowGenerator(context, 2);
            EncogProgram prg = (EncogProgram)rnd.Generate(new EncogRandom());
            RenderCommonExpression render = new RenderCommonExpression();
        }