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The formation mechanism of operons remains controversial despite the proposal of many models. Although acquisition of genes from other species, horizontal gene transfer, is considered to occur, definitive concrete cases have been…

This paper has been withdrawn by the author because it was a speculative investigation.

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This paper has been withdrawn by the authors. due fail of replacement of the paper. new version is hep-ph/0201214.

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This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

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This paper has been withdrawn by the authors due to some fatal errors in the analysis.

This paper has been withdrawn by the author due to a new work in [arXiv:0901.0456v4] which can contain the results in this paper.

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This paper has been withdrawn by the authors due to an unlikely results.

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This paper was withdrawn by the authors.