Answer:
Please explain more
Step-by-step explanation:
1. b
2. b, c
3. b, c, d, e
4. b, c, d, e, f
5. b, c, d, e
6. a
7. f
8. b, c, d, e
9. b, c, f
10. ?
11. b, c
12. b, d
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