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1, 2, 4, 7, 12, 22, 41, 76, 141, 261, 484, 899, 1667, 3093, 5739, 10648, 19759, 36664, 68034, 126243, 234256, 434686, 806603, 1496733, 2777339, 5153632, 9563084, 17745265, 32928126, 61101455, 113379904
(list;
graph;
refs;
listen;
history;
text;
internal format)
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