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1, 8, 41, 272, 1168, 7428, 30302, 189808, 759101, 4724160, 18728841, 116207424, 458829051, 2842936320, 11203933255, 69378730880, 273211969075, 1691519468760, 6660034471595, 41235710124400, 162381981186970, 1005560117623204, 3961069262796800, 24534901740913872
(list;
graph;
refs;
listen;
history;
text;
internal format)
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