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1 A

2 A+

3 A++

4 B

5 B+

6 B++

7 B+++

8 B++++

9 B+++++

10 C

11 C+

12 C++

13 C+++

14 C++++

15 D

16 D+

17 D++

18 D+++

19 D++++

20 D+++++