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1, 12, 77, 450, 2154, 11592, 51060, 261720, 1106790, 5562216, 23051943, 114491286, 468950860, 2313509520, 9409147640, 46221336720, 187136146566, 916762621320, 3700703183930, 18096198791748, 72903667955404, 356052268340208, 1432473805470840, 6990085402419600, 28096469154731484
(list;
graph;
refs;
listen;
history;
text;
internal format)
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