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This paper has been withdrawn by the author due to a crucial sign error in equation 1
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This paper has been withdrawn by the author due to the presented idea is wrong.
This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).
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This paper has been withdrawn by the authors. It has been replaced by the papers: "Drawings of Planar Graphs with Few Slopes and Segments" (math/0606450) and "Graph Drawings with Few Slopes" (math/0606446).
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This paper has been withdrawn by the author: it was a too preliminary version.
This paper has been withdrawn by the author due to a crucial error.
This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.
This paper was withdrawn by the author because severe errors were discovered.
This paper has been withdrawn by the author due to a crucial error in one of equation in (3).
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The paper has been withdrawn