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LexBFS.py

Lexicographic breadth-first-search traversal of a graph, as described
in Habib, McConnell, Paul, and Viennot, "Lex-BFS and Partition Refinement,
with Applications to Transitive Orientation, Interval Graph Recognition,
and Consecutive Ones Testing", Theor. Comput. Sci. 234:59-84 (2000),
http://www.cs.colostate.edu/~rmm/lexbfs.ps

D. Eppstein, November 2003.