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Here's the question:

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How do we go about doing this ? I have very little knowledge on petri nets. Can someone answer it for me ? (And regarding the program part , just give me an idea on what to do maybe like an algorithm?)

Thanks so much !

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FWIW: petri net. (Didn't know what it was until I looked it up.) –  Willie Wong Apr 25 '12 at 9:34

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