a a b a b b a a b b a
1 1 1 2 2 2 2 2 2
7 8 9 0 1 2 3 4 5
17. A
18. A
19. A
20. I'm not sure
21. B
22. A
23. A
24. B
25. A
I hope this helped, and I am sorry I could not answer 20.
