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I've adjusted venn2, venn3 and venn4 so that they return the Figure and Axes objects that were created. This is more convenient as it allows further adjustments to these objects.
Furthermore I've added 'figname' as a keyword so that the Venn-figures can be saved to a file.
It can be used exactly as before (backwards compatible) except that it creates a figure file when you run it from the command line (i.e. run test()).