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1 A	1 B	1 C	1 D
10 A	10 B	11 A	11 B
12 A	12 B	13 A	13 B
14 A	14 B	15 A	15 B
16 A	16 B	17	18 A
18 B	19 A	19 B	2 A
2 B	2 C	2 D	20
21	22	23	3 A
3 B	4	5 A	5 B
6 A	6 B	7 A	7 B
8 A	8 B	9 A	9 B

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