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a 2 3 4 5 ± 6 a 7 8 9 10 11 12 13 14 15 16 18 19 ± 20 …...a 1 2 3 4 5 6 ± 7 a 8 9 10 11 12 13 14 15 16 18 19 20 21 22 23 25 26 27 ± 28 a 29 30 31 30 0 23 22 22 22 22 22 0 0 0
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