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This paper has been withdrawn by the author because it needs a deep methodological revision.

This paper has been withdrawn by the corresponding author because the newest version is now published in Discrete Applied Mathematics.

The paper was withdrawn by the author. Further research is needed.

This paper has been withdrawn by the authour.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due a few mistakes in the paper.

This paper has been withdrawn.

This paper has been withdraw by the author due to adding more modeling results.

This paper has been withdrawn by the author due to incomplete interpretation for the results.

This paper has been withdrawn by the author, due an error in claim 1.

The paper was withdrawn because of its significant overlap with a paper appeared recently.

This paper has been withdrawn by the author due to a gap in the proof of the main result.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a crucial error in the definition of homomorphism.

This paper has been withdrawn. Its new version has been published.

This paper has been withdrawn.

This paper has been withdrawn by the author, due to possible counter-examples.

This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).

This paper has been withdrawn by the authors, since it has been merged with Part I (ID 0802.3570)

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.