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1, 3, 8, 15, 34, 70, 162, 388, 1020, 2729, 7580, 21112, 59398, 166990, 471635, 1332492, 3776712, 10721570, 30518960, 87046334, 248852142, 712831894, 2045974474, 5882821341, 16943916873, 48878646537, 141209193981
(list;
graph;
refs;
listen;
history;
text;
internal format)
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