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1, 2, 2, 7, 30, 113, 442, 1692, 6542, 25213, 97548, 377617, 1465010, 5690787, 22140830, 86250091, 336416094, 1313641661, 5134950280, 20091508863, 78682553016, 308392187964, 1209658474836, 4748241492783, 18650595931506
(list;
graph;
refs;
listen;
history;
text;
internal format)
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