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This paper has been withdrawn

This paper has been withdrawn by the authors due to missing references to earlier work and an error in the interpretation of Figures 2 and 3. A corrected version is in preparation.

This paper has been withdrawn by the author due to an error in Lemma 3, making the (bijective) proof of Theorem 4 and Corollary 5 invalid (symmetry of k-nonnesting and k-noncrossing set partitions).

Withdrawn by authors.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author, due to errors in Groebner basis calculations in the cases of five and six dimensional groups.

There are some problems with this paper, and it is being withdrawn.

The authors have decided to withdraw this submission. Clarifications/corrections, if any, may follow at a later date.

This paper has been withdrawn

This paper has been withdrawn.

This paper has been withdrawn by the author.

This paper has been withdrawn because the result turns out to be trivial.

This paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn by the authors due to the fact that the webs considered in the paper are ``Veronese-like webs'' which are different from Veronese webs.

This paper has been withdrawn by the author due to new results to be added.

This paper has been withdrawn by the authors due to some errors.

This paper has been withdrawn by the authors, due a oversimplified decoherence model. It will be substituted by a new work.

The paper has been withdrawn by the authors. The contents of the paper will be used in a future communication which will contain major addition and shift of focus.

This paper has been withdrawn by the author; a revised version is part of the author's phd-thesis "Quasi-logarithmic structures" (Zurich, 2007).