Well this thought arose from a small psychological problem i had a few days ago. I reached Level 5 on Conbinatorics and suddenly found that my zeal for solving problems (specially the computational ones) decreased a bit. As long as i was on level 4 i had an apetite for level 5 but now that was gone.
This apart i think level 4 and 5 have far more ranges than to be covered in two levels. So i think they can be organized into some more Levels increasing the number to , say , 7?
Please @Calvin and other staff pay a heed to this. And others may share their views. thank you.