What is the difference between Grade R and RR?

The information provided on this website is for general informational purposes only; while we strive for accuracy, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability, or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. We are not in any way related or representative of the institutions presented here.