I have been working on this problem for months but this problem seems to be harder than I expected. The most recent result is from Prof. Ed Reingold, listed here: http://emr.cs.iit.edu/~reingold/algorithms.shtml. If any one is interested in this problem, or you want to inspire me, write to zig [dot] wei [at] gmail [dot] com please.
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05 Apr 2006 / Research
