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1, 1, 1, 1, 1, 1, 1, 2, 9, 37, 121, 331, 793, 1718, 3454, 6646, 12841, 26589, 61813, 158918, 426401, 1134431, 2914055, 7171539, 16967745, 39008002, 88529366, 202057561, 471422866, 1133448790, 2799775102, 7026467132, 17684574313, 44192085565, 109081884957
(列表;图表;参考文献;听;历史;文本;内部格式)
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