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Please do not use the subject to ask a question without clarifying it! So what exactly do you want? Can you give some more descriptions? Kev -------------------------------- Ko-Kang Kevin Wang PhD Student Centre for Mathematics and its Applications Building 27, Room 1004 Mathematical Sciences Institute (MSI) Australian National University Canberra, ACT 0200 Australia Homepage: http://wwwmaths.anu.edu.au/~wangk/ Ph (W): +61-2-6125-2431 Ph (H): +61-2-6125-7411 Ph (M): +61-40-451-8301