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This paper has been withdrawn by the author, due to an error in the proof of Theorem 3.8.

This paper has been withdrawn by the author due to imprecisions which must conduce to wrong results.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors

This paper has been withdrawn since the results are not satisfied.

This paper has been withdrawn by the author [arXiv admin].

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to some error in the result

This paper has been withdrawn by the authors due to some errors.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a mistake in the section 4.

This paper has been withdrawn due to a crucial error in the proof of the main theorem

This paper has been withdrawn by the author, due a crucial error in the optimization. For the last one month I have been trying to remove the error, but it seems to take a lot of time so I decided to withdraw this paper for the moment.

This paper has been withdrawn by the author due to an error in an inequality in the proof of Theorem 1.1.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a critical error in the proof of Theorem A pointed out by Burkhard Wilking.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn by the author for further modification.

This paper has been withdrawn by the author, because it is now part of an enlarged version entitled "Time functions as utilities" arXiv:0909.0890

This paper has been withdrawn by the authors.