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Gabor,

As a mathematical framework, I would use a hypergraph rather than a 
graph for your data.

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Mason

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  Mason A. Porter
  University Lecturer (and Tutorial Fellow, Somerville College)
  Oxford Centre for Industrial and Applied Mathematics
  Mathematical Institute, University of Oxford

  Homepage: http://www.maths.ox.ac.uk/~porterm, IM: tepid451
  Blog: http://masonporter.blogspot.com/
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  "That's my new excuse, and I'm sticking to it." (Me)
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