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Aug 24, 2010 at 15:37 comment added user8760 Thanks a lot for Gerry's answer. Sorry I do not know how to make this a comment(in stead of an answer), nor how to formally "accept" Gerry's answer. In view of Gerry's answer, the complete solution of the problem looks much less likely. I am still(even more eagerly) looking for any possible reference about the status of the said problem. Thanks again!
Aug 24, 2010 at 6:27 history answered Gerry Myerson CC BY-SA 2.5