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Generalised as described by Pearson, Robins & Zhang, 1999.
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from cogent.core.tree import TreeBuilder
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from cogent.phylo.tree_collection import ScoredTreeCollection
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from collections import deque
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__copyright__ = "Copyright 2007-2009, The Cogent Project"
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__credits__ = ["Gavin Huttley", "Peter Maxwell"]
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__maintainer__ = "Gavin Huttley"
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__email__ = "gavin.huttley@anu.edu.au"
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__status__ = "Production"