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1, 9, 27, 81, 198, 459, 972, 1989, 3861, 7290, 13284, 23679, 41148, 70218, 117504, 193671, 314262, 503415, 796068, 1244988, 1925910, 2950668, 4478328, 6739497, 10059228, 14901471, 21914442, 32011119, 46456272, 67010679, 96093864, 137039922, 194395221
(列表;图表;参考;听;历史;文本;内部格式)
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