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Jul 2, 2011 at 1:12 comment added Sergei Ivanov The 2-dimensional case is indeed easier; it is completely solved by now - see my answer.
Jul 1, 2011 at 19:43 comment added Greg Kuperberg Your answer is so close to the mark that I suppose that I should accept it (or rather the paper that you cite) as the state of the art. In any case these authors are surely good people to ask.
Jul 1, 2011 at 19:08 history answered Jean-Marc Schlenker CC BY-SA 3.0