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Hi Fidelbc, thanks again for your reply.

I think I figured out how to get the graph done, thanks for all your help.

Just one more small question, my output graph (same as what you got as output), seem like the graphs are not displayed fully, some of the edges or loops at the end of the graph seem cut off. I tried to re-scale the image to make it bigger, but still resulted the same graph. Do you know why this happened? Is there anyway to fix it to make the graph displayed fully?

Thanks a lot.