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1, 3, 8, 20, 49, 117, 280, 656, 1551, 3597, 8442, 19460, 45457, 104387, 243086, 556842, 1294027, 2959369, 6867428, 15687806, 36368875, 83015759, 192321728, 438755532, 1015963203, 2316887259, 5363009706, 12226893148, 28295070847
(list;
graph;
refs;
listen;
history;
text;
internal format)
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