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\paragraph{Acknowledgements}

We thank Stefan von Deylen for pointing out the work of Sander~\cite{Sander1}, and for stimulating discussions. We have also benefited from discussions with Arijit Ghosh.

This research has been partially supported by the 7th Framework Programme for Research of the European Commission, under FET-Open grant number 255827 (CGL Computational Geometry Learning).


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