@RequestMapping({"/step"})
	public ModelAndView wordStep(HttpServletRequest request, HttpServletResponse response, ModelAndView modelAndView,
			@RequestParam(required=false, defaultValue="") String grade, 
			@RequestParam(required=false, defaultValue="") String stage) throws Exception {
	    
		ModelMap modelMap = modelAndView.getModelMap();
	    
	    modelMap.addAttribute("grade", grade);
	    modelMap.addAttribute("stage", stage);
	    
	    return modelAndView;
	}