Generally, it is recommended to avoid qualitative measures when quantitative solutions exist. However, if the genuine need arises here are a list of useful Venn diagram widgets that may be found online:
Quite Powerful: http://bioinformatics.psb.ugent.be/webtools/Venn/
Simple Solution: http://www.bioinformatics.lu/venn.php
Downloadable: http://pcarvalho.com/patternlab/vennDiagram.shtml
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