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This paper has been withdrawn by the author as the conjecture proposed in it is wrong.
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This paper has been withdrawn by the author.
This paper has been withdrawn by the author due to an error in the sufficient condition given for the proof of the Tate conjecture for Catanese surfaces.
This paper was withdrawn (temporarily?) by the author since an error needs to be corrected.
This paper has been withdrawn by the author, due to a crucial error in the proof of Thm.1
This paper has been withdrawn by the author due to essential mistakes in some previous versions.
This paper has been withdrawn by the author.
This paper has been withdrawn by Reinaldo O. Vianna.
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This paper has been withdrawn by the author, due a critical mistake on page 3.