Wu Gang is a little excited. He didn't expect that when he wanted to fall asleep, he would find a pillow. It seemed that his luck would be good this time.

Looking closely at this nine-square grid, you can see that it is divided into: average, good, very good, excellent, bad, very bad, extremely bad, stars, and the beginning in the middle.

"Stars?" Wu Gang is confused. He could understand everything else, but what is going on with these stars?

Of course, this did not ...