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This paper has been withdrawn by the author. This draft is withdrawn for its poor quality in english, unfortunately produced by the author when he was just starting his science route. Look at the ICML version instead:…

This paper has been withdrawn by the author, due a crucial error in the optimization.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.

The paper has been withdrawn by the author, due to it being fundamentally flawed. The author apologizes for any inconvenience it may have caused.

This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author, because it is now part of an enlarged version entitled "Time functions as utilities" arXiv:0909.0890

This paper has been withdrawn by the author

This paper has been withdrawn by the authors due to lack of significant consideration.

This paper has been withdrawn

This paper has been withdrawn by the author due to its publication

This paper has been withdrawn by the author.

This paper has been withdrawn by the author: it was a too preliminary version

This paper has been withdrawn by the author

This paper has been withdrawn.

This paper has been withdrawn by the authors. Significantly revised versions of the results of this paper are now available in arXiv:0707.0487v2 and arXiv:0808.3169v1.

The paper is being withdrawn since the authors felt that the submission is a little premature after a careful reading by some of the experts in this field.

This paper has been withdrawn by the author, due a crucial error in Eq. 6.

This paper has been withdrawn by the author.

This paper is being withdrawn.

This paper has been withdrawn by the author.