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[cocorico <>]

What I am trying to do is to iterate through the edges bounding each face,
but for each edge perform a numeric operation that requires the coordinates
of the site contained in the current face being iterated.  

However, I was not able to find on the Voronoi_diagram_2 API a way to access
the site inside a given face, which would be useful for what want to do. 
Thus I also thought about perhaps iterating through the sites of the voronoi
diagram and for each site, somehow iterate through the edges bounding the
face in which the site resides.  Unfortunately, although the
Voronoi_diagram_2 API specifies an edge circulator around a face referenced
by a Face_handle, but it does not specify a way to circulate the edges that
bound the given voronoi site.  





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