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J. M. Pallo, "Enumerating, Ranking and Unranking Binary Trees", The Computer
Journal, volume 29, number 2, 1986, pages 171-175.

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Taking C<Lweights> as coordinates allows the graph to be drawn as an N-1
dimensional rectangular figure.  The first Lweights entry is always 1 so can
be ignored as a coordinate.  Each edge is then forward along one axis.  For
N=4 in 3 dimensions the effect is good.  Geyer draws N=4 and N=5 in this
style.  N=5 or more, in 2D projection at least, tends to become too busy to
see much.

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# Winfried Geyer, "On Tamari Lattices", Discrete Mathematics, volume 133,
# 1994, pages 99-122.
# 82586438.pdf
# 

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